From Citizendium, the Citizens' Compendium
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- Black hole : Area of space-time with a gravitational field so intense that its escape velocity is equal to or exceeds the speed of light.
- Doctor Who : British science-fiction television series depicting the adventures of a mysterious time-traveller known as 'the Doctor'; original series ran from 1963 to 1989 on the BBC, followed by a 1996 television movie; relaunched in 2005.