Vacuum
From Tardis Wiki, the free Doctor Who reference
A vacuum is an area that is virtually empty of matter, usually found in space. Most life forms cannot survive in a vacuum for very long. The few exceptions include Time Lords, for limited periods (DW: Four to Doomsday), Daleks (DW: The Parting of the Ways), Cybermen (DW: The Moonbase), and Toby Zed while possessed by the Beast. (DW: The Impossible Planet)
People known to be killed by exposure to vacuum include Katarina, Kirksen (DW: The Daleks' Master Plan), Scooti Manista (DW: The Impossible Planet) and Lynda Moss. (DW: The Parting of the Ways)
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