This is one of my favorite picture sets from the Hubble Space Telescope, it is of the Andromeda Galaxy.
The Andromeda Galaxy is the closest galaxy to ours, the Milky Way, and is over double the size at 220,000 light years across compared to ours which is 100,000 light years across.
Also in comparison is Andromeda has over 1 Trillion stars while our galaxy only has 200 - 400 Billion.
Andromeda:
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