Black holes
Sir, — Bruce Hooper comments (April 2) on an earlier report about black holes. Regarding the object’s size, both the original report (100 million light-years) and Bruce Hooper (100,000 lightyears) must be in error. The earlier report probably referred to a quasar model involving a disc of gas about one light-year across with, at its centre, a black hole about as massive as our galaxy, and therefore only about one-hundredth of a lightyear across. Black hole, theory permits their formation not only from collapsed stars but also from much greater collapsed masses (as above) and, in the primordial fire-ball, from masses as small as meteoroids. Black holes cannot themselves collapse as they already represent the highest degree of collapse possible. However, latest theory indicates that they may evaporate and even finally explode. Thus they may not be perfectly black but come in shades of grey from almost black to off-white. — Yours, NOEL DOUGHTY. April 6, 1979.
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Press, 9 April 1979, Page 20
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157Black holes Press, 9 April 1979, Page 20
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