| Timeline for 10,000,000,000 |
According to one account, Sol would explode in the year 10,000,000,000, rendering non-viable the star system in which Earth once existed. (TV: Colony in Space [+]Loading...["Colony in Space (TV story)"]) The Fourth Doctor visited Barclow in "about 10,000,000,000 AD." (AUDIO: The Well-Mannered War [+]Loading...["The Well-Mannered War (audio story)"])