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Joseph Rotblat

10th january 2012, 4.30-5.00pm, on bbc radio 4
joseph rotblat (presented by matthew parris, with professor lord martin rees and professor kit hill) (in the great lives series) 11 more words

The Galaxy's supermassive black hole

There is now overwhelming evidence that our Galaxy harbours a supermassive black hole at its centre. Not only that, but the Hubble Space Telescope has discovered that all spiral galaxies harbour supermassive black holes at their centres, and the mass of that black hole is directly proportional to the mass of the galaxy in which it resides. 665 more words