Quote:
Originally Posted by ChrisD
"Galactic" nebulas were first identified as separate galaxies in 1912, American astronomer Vesto Slipher observed that the light from these "galactic" Nebula was strongly redshifted, indicating that they was moving away from the Milky Way and so not part of it. This theory was confirmed by Edwin Hubble in 1923 using Cepheid variable stars in the Andromeda Galaxy.
The big bang theory was first postulated in 1927 by the Belgian priest and physicist Georges Lemaître.
It was known that other galaxies existed before the big bang theory was first postulated.
Chris
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Thanks Chris.
It is a great day when you learn something new.
More so to find out that you have been wrong in your understanding of something.
I was wrong as I did think the Big Bang Theory produced in effect a Universe the size of the Milky Way but if other galaxies were known to exist then that understanding is already wrong...
I wonder how big they thought the Universe was in 1927?
Thanks again
Alex