On Oct. 4, 1923, Edwin Hubble took a photographic plate of the Andromeda Nebula (as it was known then) using the 100-inch Hooker telescope at Mount Wilson. The next night, Oct. 5th, he took another ...
Sagittarius A, the intense radio source at the centre of our Galaxy, has no counterpart in the Andromeda Nebula although the structure of the nucleus is otherwise similar. The bright supernova of 1885 ...
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