Andromeda Galaxy
This is M31, commonly known as the Andromeda Galaxy. This image spans over 200,000 ly, while the galaxy itself is an unfathomable two and a half million ly away from Earth. Scientists have discovered that this galaxy is hurling towards our own Milky Way and should collide with it within two billion years. This type of occurrence is actually common in the universe, but I chose this image mostly because Andromeda was one of this week's constellations and it will impact our world sooner or later.
Site: Picture from APOD
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