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Black Holes and Beyond
Episode 4 of 6
Professor Stephen Hawking looks at how radio astronomy and the discovery of quasars affected the debate about the existence of black holes.
Last on
Fri 11 Jan 200214:00
BBC Knowledge
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Evidence of black holes
Duration: 04:44
Broadcasts
Sun 21 Sep 199719:45BBC Two except East, South East & Yorkshire- Wed 31 Jan 200108:00BBC Knowledge
- Wed 31 Jan 200111:00BBC Knowledge
- Wed 31 Jan 200114:00BBC Knowledge
- Wed 31 Jan 200117:00BBC Knowledge
- Wed 31 Jan 200120:00BBC Knowledge
- Wed 31 Jan 200123:00BBC Knowledge
- Thu 28 Jun 200120:00BBC Knowledge
- Fri 11 Jan 200208:00BBC Knowledge
- Fri 11 Jan 200211:00BBC Knowledge
- Fri 11 Jan 200214:00BBC Knowledge
