The formation of the Milky Way is one event that we’re no able to physically observe (obviously). We’re inside the galaxy at its current point in history, and so we can see how it currently looks. We observe the globular cluster system, any halo stars, the bulge and disk stars, and the satellite galaxies as they look today. However, we can also look deep into the universe and see what the cosmos was like billions of years in its past…at another place and time entirely.
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