Howling:What crashed the Byzantium?

The Howling → What crashed the Byzantium?

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Angel Bob, of course. Well, he did. But there never was an Angel Bob anymore, yet the Byantium remained crashed. As someone here pointed out, when things are remove dform time, time rewrites itself around the remove person or event. As noted in Flesh and Stone, time is unwritten, and then rewritten. We know the Weeping Angels along with a bunch of Clerics were unwritten, but we don't know how time wrote around thair lack of existence so that the consequences remain the same or similar.

As theoriesed, with Rory having never existed, time would have rewrote around Amelia's childhood The Eleventh Hour, The Vampires of Venice, Amy's Choice (which may be gone completely, as it was only a dream involving Rory, not a real, major event), The Hungry Earth, and Cold Blood. For example, the Atraxi would have been stopped differently, and so would have all other enemies in stories featuring Rory. It is like when the Doctor tried to changed a fixed point in time in The Waters of Mars - he changed the event, but time rewrote around it so that the consequences remained the same - Adelaide's granddaughter still goes into space and all of that.

It should be noted that, even with The Stolen Earth/Journey's End out of history, all evnets that happened after it (including stories set after it in the spin-offs) will still have happened the same, or very similar, as the consequences are barely affected. The only difference would be small, such as in Planet of the Dead, all Dalek invasion references would be gone. The Waters of Mars (oh dear, a fixed point in time is retconed again!) would have been rewrote, too. Adelaide would no longer have met the Dalek or lost her parents (or so we think), but time would make it so that she stills goes to Mars and all of that business, but the events leading her there would be changed, with the same sort of consequences.

Do you understand what I'm saying? Time is unwritten (people of events, or both), but then is rewritten so that not much is changed. My big question, however, is what has time done concernignt eh crash of the Byzantium? What has crashed it in the absense of the Weeping Angels who fell into the crack? Delton Menace 22:14, June 3, 2010 (UTC)

What we also need to consider is that the cracks erasing people are not the same as changing the future by manipulating the past. If the Doctor time travels to the past and stops Hitler from being born, the future changes, though someone may take Hitler's place in order to maintain a fixed point in time. The cracks however, erase people completely. Whether this is the same as changing the past is not known. That's something we need to take into consideration as well. The Thirteenth Doctor 22:20, June 3, 2010 (UTC)

The simply fact is that the past is changed, whether we like it or not. Amelia never had a childhood friend called Rory, meaning, as the Doctor confirmed, her own history has been changed. That means, when she would look back at stories that had Rory in, things would have happened differently. The cracks unwrite time, and then the timeline itself seems to have an instinct to rewrite around what has been removed. Delton Menace 00:11, June 4, 2010 (UTC)

I always assumed the peoples actions still occurred, but no one remembered them. Even though Rory was sucked into the crack, his act of preventing the Doctor from being shot still happened, otherwise the Doctor'd be dead.82.23.86.207 16:49, June 6, 2010 (UTC)Ghadius

Remember, there's not just one simple, linear timeline. For the Doctor's, all those events with Rory still happened in his personal past, even though Rory has been erased from the past of all non-time-travelers. For, say, the Northovers, history may look contradictory and paradoxical, but they don't really know enough to be sure that's true. And for most other time travelers, there's no way they could possibly discover the paradox in the first place. And that's probably "good enough" to keep the big ball of timey-wimey from collapsing and destroying all history and causality.

And when you look at the Byzantium, it's the same. Who knows that the Byzantium crashed? The Doctor, Amy, and River still remember the Angels, and the Clerics, so the story is perfectly consistent for them. The original Angel made the Byzantium crash, before it was removed from history. For the people coming to take River away, her story won't make any sense, because that Angel never existed. But they don't have enough information to see that there's anything paradoxical. And for the rest of the non-time-travelers of the 51st century, that's even more true.

As for Adelaide, I don't think that was time rewriting itself around the Doctor's meddling. If time just naturally fixed itself, nobody would have to do that. Let the Daleks beat the Nazis for Churchill in 1941, or let the War Chief win WWII for the Nazis, and who cares? The reason the Doctor had to fix those things is that time _doesn't_ naturally sort itself. In this case, just take what Adelaide said at face value--she knew that what he was doing was wrong (even if she didn't understand completely _why_ it was wrong), so she was trying to undo it, of her own free will, and succeeded. --Falcotron 03:00, June 7, 2010 (UTC)

Two Levels

I think you should look at the cracks on two levels:

First (for 'normal' viewers) they are simple enough for normal people to understand so they erase events but the consiquences are minor so erasing the Angels is not a big deal they are gone and local time is affected but stuff they did in the more distant past still 'stands'. Somethings else caused the crash but it isn't important. The Doctor was still summoned by River as she remembers the 'original' events.

On the second level (for the big fans) the cracks really do completly erase events/people except from the memories of time travellers. This means that the Angels never existed at all and the erasure changes every event they have been involved in. None of these events ever happened. The universe has substantially changed. The remaining clerics came to investigate a crash but this was not caused by the Angel; the retconned universe has adapted and only allowed the least possible change for the conclusions of the versions to both be the same. All of the specialist team (that died) did no come at all; only a crash investigation team. The lives of most of them continue as they were somewhere else. Those that actually got erased may now be 'unerased' as they would not have visited the site to be erased. Alternativly they came with the normal team and in events we did not witness get erased anyway (and do did not come to the site and get erased!). That is, there are erasure conflicts and the final erasure of the Angels may overwrite the erasure of the clerics. This allows revisions of revisions (good news for Rory fans?).

The consiquence of the second level is that there are conflicting versions of events and the events we see are only 'true' to us as we share the POV of the time travellers. We are time travelling observers just as the Doctor is so we match up with him. This does not mean that we, or him, are right. The conflict between versions may be resolved in the end and what we have seen may not be the 'final' reality. Jack Chilli 08:44, June 9, 2010 (UTC)

But we never see history right itself this way on the show (except in terms of further erasures, like Amy in VG: City of the Daleks if you don't build the chronon blocker). The Doctor or someone else has to either stop the change before it happens (DW: Attack of the Cybermen), undo the change through further time travel (DW: The Sound of Drums, VG: City of the Daleks), or introduce a later change that undoes the most dramatic effects of the change in history (VG: City of the Daleks, NA: Just War). Why bother with all of this if history could just fix itself?

Similarly, why did the Time Lords have to create and maintain the Web of Time? It's stated pretty clearly that without this, history would be fragmented and inconsistent and causality would not hold.

I don't think history in the Whoniverse rewrites itself to stay consistent; I think it just becomes inconsistent for non-time-travelers. If nobody could ever discover the inconsistency, maybe this is OK (as far as the Doctor is concerned; the other Time Lords might disagree if they were still around), but if it's a major hole in history, it has to be fixed manually, or else. --Falcotron 09:34, June 9, 2010 (UTC)

I am not suggesting that the timeline fixes itself. Reality is fixed by the observers observing it and creating the reality from all of the possible ones. There are an almost infinite versions of events generated by quantum mechanical processes and then an observer causes a collapse of a ‘wave function’ that sets the actual event. What we are seeing is different resolutions being caused. For the clerics the past is a different version to that of the doctors but the final result is the same: a crashed spaceship. This is a conflict because there is no final resolution; there are two (or many) explanations of the events. These are only at odds in the intermediate observations and memories of the participants. It may be perfectly fine for this to stay this way or it may be a very bad thing. The reality for one observer may not need to match the reality for another except at points where they interact with each other directly.

I have not read any of the novels so an unaware of the much of the web of time but isn’t the key to maintaining it to see that the events happen. Perhaps the Time Lords enforced consensus about events and their consequences. The things between these key events may have happened differently for different observers. Now, with no Time Lords there is no consensus and the whole of reality is mutable, the fixed points are not fixed at all and reality is literally whatever you think it is even if you think it is a fairytale. Jack Chilli 10:59, June 9, 2010 (UTC)

To clarify I am suggesting that the conflicting realities are resolved by concious beings (one of the most popular QM interpretations in fiction but not in real physics). When changes happen then the confliticting reailties intersect in such a way that they are compatable. This happens when one concious being interacts with another. If the doctors talks to a cleric at the end of the story then the reason the cleric is there will not match the Doctor's but all of the evidence present would match ethers history: there is a crashed spaceship. The cleric may say that it crashed because of an asteroid impact and the Doctor an Angel; they are both correct. The realities have to be compatable or the conversation cannot happen because the realities are not compatable so no communication can take place. The 'histories' of the two are as similar as possible (the spacehip has crashed) because this is the most compatable set of versions. Jack Chilli 11:21, June 9, 2010 (UTC)

Well, the Web of Time was also mentioned on TV, and, although they did go into more detail in the novels, they've discussed all kinds of related things--in particular, the idea of "fixed points in time"--quite a bit on TV, even (maybe even _especially_) in the post-Gallifrey universe. And yes, the key to maintaining it is, essentially, making sure the important thing happen--because they're not going to happen on their own.

The fixed points were never fixed in the sense that they were _impossible_ to change (although VG: City of the Daleks implies that they're _difficult_), but that it was a very, very not good idea to change them. Again, watch Attack of the Cybermen and play City of the Daleks for similar pre-LGTW and post-LGTW examples. Even the Trickster can't just change things willy-nilly; he has to use his mostly-undescribed but apparently-super-powerful abilities to fix things up around his changes, and, as DW: Turn Left proves, even he can't always pull it off.

Meanwhile, your idea that conversations can't happen between people on incommensurate timelines is directly disproven by the conversations that Amy has with the Clerics in DW: Flesh and Stone ("Who's Pedro?", etc.).

The question is, when Crispin and Phillip were erased, did the other Clerics have a brand-new history created for them, which was self-consistent but inconsistent with Amy's history? Or did they just have a self-inconsistent and paradoxical history and not notice?

I understand your point about strong-Copenhagen QM; I just don't think it's relevant here. It doesn't explain where this other history would come from and what would make it consistent. Nor does it explain why anyone would bother trying to keep history consistent if there were already a process that does it automatically.

The simplest answer is that there is no such process. The Clerics' new history is the old history, minus Crispin and Phillip. It's inconsistent and paradoxical, but nobody noticed. If Amy had pushed them, if she'd asked, "Why can you only remember 18 clerics when Bishops always command 20?", that would have exposed the hole in their history. (Sure, their brains would probably fill in a reason, but that would be pure confabulation, with no ontological substance, and it would likely be different for each one of them.)

This is exactly what happens in DW: Vincent and the Doctor--Amy is sad, but her sadness is a secret even to her, and in her Rory-less timeline, there is no reasonable explanation for it, so she just doesn't believe that she's sad--and yet, she is. --Falcotron 12:55, June 9, 2010 (UTC)

The conversation about Pedro is compatible. The cleric has arrived at that point without the need for Pedro to exits by mechanisms we have not seen (a different personal history). Any has arrived through the history we have seen. Both are there and Pedro isn’t. Amy can explain this because she knows that Pedro has gone off and been swallowed or killed or something, the cleric can explain it because he knows that there was never anybody called Pedro there first place. They are both right. The only thing that need to be consistent between then is that they are there and communicating (although it is worth thinking about the source of the radio Amy has).

As for the Universe fixing itself it is actually the conscious entities that are resolving the reality by observing it. When reality collapses due to the erasures they resolve the reality differently (but close to the ‘original’ as this is the most likely state of collapse that is consistent with their histories) The other histories are generated to explain the current state; a kind of Final Anthropic Principle thing (the universe is only in existence because it has been observed by conscious entities and therefore consciousness is a necessity for the universe to exist at all. So the think that is remaking the universe (but differently) is everybody; the universe itself does not need to.

So there is no consistent history only a personal history. These do not have to be consistent except in explaining the present moment as being consistent with some kind of past.

If Amy were to challenge the clerics then they would have a perfectly good explanation of why they were there; probably far more sensible then hers. Their history is exactly as real as hers but obviously they are not compatible.

I don’t think it’s reasonable to say “It’s inconsistent and a paradox but it’s OK because it is ignored’. This means that the Clerics have no idea why they have gone to investigate the ship or why it crashed. Paradox builds upon paradox. You might as well stop speculating because you can just go with ‘everybody forgot’ without explaining why they forgot – what thing/mechnism cleverly gave them new memories? Jack

Amy is sad because some part of her remembers Rory. The TARDIS she was dragged into may have helped her to keep a tiny inconsistency. Something tiny was preserved and I am sure we will see how soon.

Please sign your posts with four tildes (~). Also, please try to use consistent indentation; it makes it very hard to follow otherwise. I'll try to fix the indents and then come back and answer. --Falcotron 13:57, June 9, 2010 (UTC)

If the conversation is "compatible", I'm not entirely sure what you mean by the word. They both have different histories, and those histories contradict each other. If you're saying conversations can only happen when the people are both there to have the conversation--well, yeah, but so what?

As for the idea of observer-mediated collapse creating the new history, that really doesn't make sense. Something has to be in a superposition of states before it can collapse to a simple state through observation. Once you're going with CI, the other possibilities all vanished when they were observed in the first place. If you want to keep all possible histories around, you have MWI (or consistent histories or another related interpretation) and you don't get observer-mediated collapse. (And adding that the erasure collapses reality just makes it worse--if the erasure is already doing that, what's left for an observer to do?)

Saying that personal histories "do not have to be consistent except in explaining the present moment as being consistent with some kind of past" is a null statement. That's what a consistent history _is_--a history where, at each point, all of the facts, including records of the past, are consistent with each other.

Saying there is no consistent history other than personal histories is denying the entire point of the Web of Time and the general reality of the Whoniverse. The Time Lords created a meta-structure that guarantees a shared consistent history. Without that meta-structure, there would be no personal consistent histories.

For Pedro's history to be consistent at the point Amy is questioning him, one of two things must be true. Either the entire history of their church organization must have been changed so that Bishops normally only lead 18 men instead of 20 (which would mean countless changes to countless other expeditions--which will of course need to be changed again once Pedro vanishes too), or some special circumstance must have intervened that for some reason forced them to go out with 18 people instead of 20. The second one sounds more trivial, but it's still going to require creating and modifying all the strands of history that lead up to that special circumstance, and which is still going to reach back and out indefinitely.

Why isn't it reasonable to say that Pedro's history is inconsistent and a paradox? This is exactly why changing time willy-nilly is bad: it leads to inconsistencies and paradoxes. That's why the Time Lords had to create the Web of Time in the first place. That's why the Doctor is freaked out about Earth being destroyed in 1986 or humanity being killed off in 1963, etc. (I mean beyond just the liking humans bit--he's freaked out in a way that he expects the Cybermen and Daleks, respectively, to be able to understand and even to agree with.)

The surviving Clerics went to investigate the ship because River Song convinced them they had to. Why did she do that? There is no answer, in their timeline. That won't necessarily stop them from looking for one. They might be happy with the belief that she was conning them, or that she was wrong. Or maybe they'll subject her to some perfect futuristic lie detector, and re-evaluate all of her evidence. But it doesn't matter how deep they dig; they'll never get to the answer. And, most likely, the won't dig far enough to prove that there is no answer.

Of course they could ask River (or the Doctor or Amy), who could then explain, "You went there because of Weeping Angels that in my timeline existed up until they fell into the crack and no longer do, but in your timeline never existed." And maybe they could prove River isn't lying or crazy, and her temporal physics is perfectly sound. But even then, there still was no consistent reason in their timeline. Their present is not consistent with their past, period, even if it's consistent with someone else's past. Therefore, their history is not consistent. (The overall history of all of the timelines combined is, of course, consistent, but that doesn't buy you anything useful. And, again, if it were useful, the Web of Time would be unnecessary.)

Whether that's "OK" is a judgment call. That's the way the universe _is_, unless someone fixes it. I suspect the way the Doctor makes those calls is that unobserved paradoxes are an acceptable part of the big ball of timey-wimey, and not worth the effort to fix; it's only observed paradoxes that need to be prevented or undone. (I also suspect that the Doctor is just "pretty good" at predicting the difference, not perfect.)

As for "what thing/mechnism cleverly gave them new memories" in my version--the human brain. The brain does this, all the time, even with no time travel. (Last I heard, "fuzzy trace theory" was the hot new explanation for what I'm talking about among cognitive psychologists, but I'm sure that's been discredited and the phenomenon has been split in two again by now.) --Falcotron 14:45, June 9, 2010 (UTC)

Sorry if the i have not explained clearly. I will try again.

I am indeed suggesting that virtually all of history and reality changes when somebody disappears. Imagine I am with two brothers Frank and Ben in a pub; they are virtual strangers. I am an experienced time traveller but the brothers are not. Frank nips off to the toilet and is erased from history. I am suggesting that Ben never had a brother at all. The crack caused the disassociation (not collapsed it) and Ben’s history is now not consistent with the ‘facts’ (the current quantum state of the universe or something like that). Ben’s past changes otherwise he could not be where he is (brotherless in a pub). The previously collapsed wave function that gave him his history is no longer collapsed. Ben now has an almost infinite number of histories (none of which contain any connection to Frank) some of which end up with him being in the pub alone with me and many more that do not. Ben is a conscious entity and cannot exist in this indeterminate state so his consciousness causes the wave function to collapse once more and one history resolves itself from the near infinite. This may be the path of least possible change (remembering they every event that involved Frank is changed so that’s nearly everything so a lot has changed). In effect his consciousness creates a history that is now consistent with there never having been Frank. Not a memory of a history; an actual history including new memories.

I have the same history as I did before Frank was erased because my time travel thing has protected me. My past is fairly solidly fixed and my present can’t suddenly change. As I am in the pub with Ben he cannot vanish so the only valid histories the wave function can collapse into are one that end up with him being in the pub in front of me. Most of the possible histories can’t form and so –pop- Ben is with me but he never had a brother. He will be able to tell me exactly how and why he is in the pub but it will not match my story. He will remember coming in with me; everybody else will remember that too. It is their reality and it is a valid one. Mine is different but valid to. All of the non time travellers have a history that is totally consistent with their pasts because they are the real pasts.

The universe has changed and now seems wrong to me but my history needs to be consistent too. What I mean by consistent is that Ben can’t vanish from in front of me as this would alter my time traveller history (which is apparently a special case). I would not have a set of observations that would lead to me being in the pub with Ben if he were never there in the first place. Although thinking about it I could have a consistent history that does allow for this if say, Ben was transported away by a matter transporter the instant his brother is erased. If I were not present then Ben might not have been in the pub at all; who goes to the pub alone; there would be less restrictions on the changes that have taken place. My time-traveller presence enforces some restrictions.

The doctors presence at the crash site enforces the restriction that there must have been a crash (he has observed it). The consequence is that the clerics can only form new histories (ie collapse the new wave functions resulting from the erasure) that contain the crash. This has the knock on effect on virtually everything else. The clerics remaining towards the end of the story have valid reasons to be there. They are not being self deceptive at all. It would have been nice if there was a conversation with them about what they saw happen.

The doctors is genuinely surprised that time can be rewritten despite all of the ‘changes’ he has made to time (monster in the window is the latest one). The cracks seem like a process that the time lords did not encounter or understand. The Web of Time may not be necessary for the universe to exist at all; it may only be needed for the universe to exist how the Time Lords wanted it to; they wanted a universe with fixed chains of events and made it so. Perhaps there are no more “fixed points” (which were only arbitrary plot devices mostly) anymore and the web has gone. Every story is valid; every possibility is open. The past can be almost totally rewritten and there is no problem with continuity and no paradox. There aren’t even multiple universes; just a past that is in flux as much as the future.

I am aware that I am misusing the ideas of Eugine Wigner (“the silent genius”) but it’s only TV. I’m only suggesting it because of what he did with the original Angels; this was a similar concept in some ways. Imagine Moffat trying to explain the suggestions I’ve put forward! That would be impressive telly. Jack Chilli 16:16, June 9, 2010 (UTC)

OK, what you're missing is that you can't just uncollapse Ben's current state to give him a consistent personal history; you'd have to uncollapse every state he collapsed in the past, and that would affect everyone he'd ever interacted with in the past (probably just everything in his past light cone, period). (Also, as a side note, if the erasure is actually removing eigenstates from the vectors, then the _Doctor's_ collapsed state is no longer compatible with the superposed state that preceded it--you can collapse "A-or-B-or-C" into A, B, or C, but you can't collapse it into D.)

And, again, your second paragraph contradicts what we've seen. You say that Ben can't vanish from in front of you. And yet, Amy vanishes from in front of the Doctor in City of the Daleks. (In the "canonical version" of the story, of course, the Doctor builds a "chronon blocker", which prevents her from completely vanishing, for just long enough to undo all the changes to history. But if you screw that up, Amy does completely vanish. And, even if you get it right, she's gradually being erased from history the entire time, becoming less visible and less able to interact with everything else.)

Nobody ever said the Web of Time is necessary for the universe to exist. (Although a few times, the Doctor has said that damaging it could cause damage to the continuum itself, you could argue that this just means the Time Lords have sort of nailed it down to the fabric of spacetime or something.) What has been said is that it's necessary for history to be consistent and causality to work.

And if there aren't multiple universes, how do you explain the travel between parallel universes that has been seen on the show, both pre- and post-LGTW?

If you want to say that everything the show ever said about any of this was wrong, you can--but in that case, you're really not talking about Doctor Who; you're talking about another show someone else could have written. I'll agree that there are all kinds of ways time travel can be fit into science fiction--but not all of them are consistent with what we know about Doctor Who.

Finally, it's not so much that you're misusing strong-CI (which, by the way, Wigner was arguing _against_, not for, with his thought experiments)--I agree that the kind of misuse you're suggested is common and maybe even reasonable for pop sci-fi--as that you're trying to have strong-CI (observer-dependent collapse) and MWI (the combined state keeps developing forever because there is no collapse) at the same time, which to quote Pauli, is not even wrong. --Falcotron 18:40, June 9, 2010 (UTC)

Firstly let me say that I am not arguing with what everybody else has said in the past. I am not aware of their discussions at all; I am new here. I am merely trying to present an explanation of how the cracks work from what I have seen and what has been said ‘in show’. This is generally all I have knowledge of. I know that this site includes almost everything as ‘canon’. What is Moffat’s ‘canon’? If this is different then it could explain the changes and the difficulties.

I am also not a quantum physicist so my idea does not match real science. It’s not supposed to; it’s meant to give a plausible explanation of the ‘Doctors reality’.

Again I’m sorry if it was not clear the single collapse is not single; the whole history is changed and this requires all of the prior states to change. That’s what I mean be a new history; a complete new history. Someone erased is really really erased. I’m an arguing for the most drastic type of revisionism; the whole light cone changes as must every other that touches it so probably everything in the universe right back to the start. This may mean the “Big Bang” as the start.

The Doctor is a time traveller and that’s why his history is a special case. He has separate rules and his state does not change when somebody is erased so his past is not changed. His time-travelly nature prevents the ripple back through his personal history. Note the exceptions though, when Rory got rubbed out there was a difference; one that seemed fairly arbitrary at the time. It might be worth looking at this later.

My past is not changed by the absence of Frank. I anchor Bob in the pub; reducing his possible histories so that he has to end up with one where he is still with me. We can then spend plenty of time arguing about what happened to Frank and we are both right. The universe I have experienced does not need to match Bobs except to the extent that we are both in the pub at the time having an argument about Frank.

I am saying the parallel universes are not needed for the erasing effect. They may exist independently or dependently of the main universe. I’m just saying they are not important to this discussion.

I am also not arguing for multiple worlds at least not in the usual sense; just the possibility of consciousness selecting from multiple possibilities to ensure that it survives (only one word is ‘realised’ so there was only ever this one world; non split off). You might argue that this ends up in one world per consciousness that intersect when the consciousnesses interact.

I think that it comes down to I’m not satisfied that false memories are OK so I’m looking for a pop-science explanation that is a little bit better. Remember, all of the expatiations for Doctor Who are just pop-science. Its central premise is time travel after all. How did the Weeping Angels operate originally? Moffat used some vague quantum stuff and an observer effect. He could be doing this again.

I have not seen City of the Daleks. Is it part of the story designed by Moffat?

Now, what would happen if the Doctor went back to look to see why Amy does not remember the Daleks. Isn’t this a rather obvious thing for him to do especially with all the crack in time? He would not need to go anywhere near where he had been before; lets say he goes to Austraila. Would he just find that everybody had forgotten? All evidence (TV footage damage) gone and everybody oblivious. Or, would he find that the world he experienced is not there; the events literally never happened? There is a real conflict between his past history and the reality that now exists. What would this do to him? Jack Chilli 20:05, June 9, 2010 (UTC)

City of the Daleks is the first of the Doctor Who Adventure Games. According to Wegner and Moffat, the Adventure Games are a canonical part of series 5. To quote Wegner, "There aren't 13 episodes of Doctor Who this year. There are 17 - four of which are interactive. Everything you see and experience within the game is part of the Doctor Who universe." Read the articles on that episode and the series as a whole.

For your example, I'm not sure why going to Australia would be any different from going to Leadworth, but I'll take it your way. If the Doctor visited 2010 Australia in next week's episode, he would find (assuming his guesses are right) that Journey's End never happened there, and nobody remembers it. The history might be, but wouldn't necessarily be, inconsistent. And the Doctor would have to decide whether it has to be fixed.

Briefly wandering away from established information into speculation, there could be another 2010 Australia where Journey's End still happened exactly as he remembered it, and everyone there of course remembers it, and that copy could be connected to the Time Vortex just like any parallel universe if the Doctor could find it, but it would take at least some additional research and/or technobabble to find it, and even then it might not be possible. But this gets into the question of what the actual difference is between "parallel" and "alternate" timelines in the Whoniverse (other than how they're created), and whether an alternate timeline created by the time energy is the same thing as one created by a mischievous time traveler, and other things that we can only guess at.

Getting back to what we actually know from the show: Once you've acknowledged that rewriting time potentially means going all the way back to the Big Bang, you have to go to the next step. Even that may not be enough. If the universe is finite, there are only a finite number of possibilities. It may be that there is simply no way the universe could have developed that would lead to you and Bob talking in the pub if Frank hadn't existed. (It may be worth mentioning that infinite superpositions are a serious problem for quantum mechanics, one of the reasons the idea of "chronons" was first postulated--an idea that the show picked up from physics in name, if not in meaning.) So, what happens then?

For a simple case like that, it may seem implausible that there would be no way it could happen. But looking at something like the cracks erasing Angels who killed people who weren't themselves erased, or all the effects of Rory not existing on the events of this season, or huge events like Journey's End being erased, or the Eighth Doctor using a De-mat Gun that removes millions (many of them time travelers!) from time at once to end the LGTW, it starts to look a lot more likely. I suppose you could argue that these changes just aren't possible if there's no way to make them consistent (a sort of meta-Novikov Principle), but that would be postulating a constraint we have no evidence for.

There's also the Blinovitch Effect (the original version), which would seem to be completely unnecessary in your theory.

Finally, if I can return to the novels again, you should at least read the summaries of the Enemy- and Faction Paradox-related EDAs on this site. Some of the issues are too complex to get into here, but one is dead simple: FP's entire point was to make changes that would leave "bare paradoxes" in history. Your theory seems to make this impossible. --Falcotron 21:53, June 9, 2010 (UTC)

I like that problem very much. If a situation develops where there is no possible resolution then perhaps there can be no universe. That would be bad; exactly the sort of bad that the Doctor would have to fix once he figures out what is going on.

Anyway, my suggested process (or one similar) is highly unlkey to be used as it is is too complicated to explain in the TV serial I feel. In fact a 'proper' explanation is unlikey to be given in full or many conflicting ideas may come forwards from different writers. Consistantacy does not seem to be that important from a quick check of the events in the novels, comics and old stuff. Jack Chilli 07:11, June 10, 2010 (UTC)

Consistency definitely wasn't important in the classic show and the comics. But in the novels, it was. Half of the people writing them were the fanboys who used to write in to DWM complaining about how the Doctor's explanation of the Blinovitch Limitation Effect in Mawdryn Undead contradicted the way it worked in past episodes, and the like. Of course sometimes the authors argued with each other about things, leading to things like other authors ignoring John Peel's revision of Dalek history or Lance Parkin disagreeing with the way they ended his War arc and rewriting the ending in a later book and starting a new spinoff series. But those problems came up because the novel writers cared deeply about continuity and consistency, not because they ignored it.

In the revived series, the fans have taken over the asylum. RTD was an NA author, and so were half the others he brought in to write for him.

Meanwhile, Moffat has said (I'm going to paraphrase here rather than search for the quote) that he's surprised at how few "real time travel stories" Doctor Who has done for a show about time travel, and one of the main things he wants to do is to change that. Of course the novels (and, to a lesser extent, the audios) _have_ done real time travel stories (especially the War arc I mentioned above), and Moffat knows the novels; it's just that the TV series hasn't done it. Paul Cornell argued that the reason the series hasn't done it isn't that it would have been too complicated for the viewers (it's not as if Andrew Cartmel ever let that get in the way...), but because the lack of consistency made it impossible to write anything that didn't suck (and he even pointed to Mawdryn Undead as an example).

Anyway, if this season's big arc story is Moffat's "real time travel story" (and it obviously is, at least in part), then he'd have to have come up with a consistent mechanism for how all this stuff works, and made sure everyone used it consistently this season. And, since he's as much a fanboy as the rest of us, but also an experienced TV writer, I think with respect to what's come before, he'd try to keep it as consistent as possible, but no more (as in, he wouldn't deliberately throw away major bits of continuity unnecessarily, but he also wouldn't let some throwaway line from a 4th Doctor episode get in the way of a great plot line). --Falcotron 00:29, June 11, 2010 (UTC)

Yes. I think that Moffat is really trying to do a real time travel story and I think that he is capable of a good one. As he is able to adjust the scripts and add bits in then he can place moments to suit his needs; sometimes this has been obvious (Rory's death and erasure stuck on the end of an episode) and some of them may be so subtle we haven't seen them at all. He also knows he's writing for two audinces and what he does needs to make sense to the people that have only watched the new series. I really don't know what his mechanism will turn out to be but I really do think (somehow) that he really means that the cracks actually do erase things from time itself with all of the problems this will cause. This does not seem to be the same thing as the doctor fixing timelines ("What are you thinking?" "Time can be rewritten" seemed to be a genuine revelation to the Doctor) so it's not even the same as the mighty De-Mat gun. A new paradigm for how the universe works might be too much("You canna change the laws of physics")but who knows? RTD tended to plant hints in episodes; just key words plonked in most of the time. From the rich and convoluted scripting, plotting and sequencing of something as simple Coupling you can see how much more Moffat is capable of. Jack Chilli 09:06, June 11, 2010 (UTC)

PS there is a time travel story based around stonehenge and quantum mechanics. I can't remember it clearly though. Something to do with the Xyleee? Jack Chilli 09:06, June 11, 2010 (UTC)

Skimming over most of the stuff, I think most people are forgetting something: The Cracks are symptom of the universe ceasing to exist, imagine the universe is a quilt and you start pulling cutting pieces out and pulling out threads the rest of the quilt remains unchanged. Basically when time travel is usually used to change something in the whoniverse the quilt is restitched but in the case of the Cracks the universe is literally falling apart. Hence when something was erased from history nothing changed because the universe simply wasn't capable of repairing itself properly leaving a universe that made no sense, a fact that was pushing into the extreme during The Big Bang. When Earth was all that remained, which as it stood made no sense since nothing else ever existed; the stars that forged the heavy atoms that make up Earth and everything on it, the history of things that occurred on Earth, that all never happened yet Earth and a (corrupted) version of it's history continued to exist. Basically the history left in place after the Cracks is a patchwork history left by the universe unable to repair itself. The Light6 ^{talk to me} 12:48, September 30, 2011 (UTC)