The world is full of galaxies. About 100 billion we know of. The first galaxies were discovered by Hubble in the 1920s when he realised that some things that were considered to be agglomerations of stars from our galaxy (called nebulae) where in fact other galaxies.
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Adrian commented on :
The world is full of galaxies. About 100 billion we know of. The first galaxies were discovered by Hubble in the 1920s when he realised that some things that were considered to be agglomerations of stars from our galaxy (called nebulae) where in fact other galaxies.