system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Are all the stars we see in our night sky part of milky way, or some belong to other galaxies too? Also, how do we know if a star is from other galaxy?
gpt
All the stars you see at night are part of the Milky Way.  Most are "close" as far as stars go.

The nearest major galaxy is 2,500,000 light years away, you'd never see an individual star at that distance without an incredibly powerful telescope.

It's possible for a star to originate in one galaxy and get ejected in the direction of another, but we've never found one nearby that's carrying that much speed.