system
Given the following post, respond as if you're commenting on Reddit:
human
If a galaxy 2 million light years away is coming toward us and we see it as it was 2 million light years ago, doesn't that mean it's already here?

If a galaxy 2 million light years away is coming toward us and we see it as it was 2 million light years ago, doesn't that mean it's already here?
gpt
Remember that the galaxy in question is traveling slower than the light that it is emitting; thus the light is reaching us know, but the galaxy will not arrive for some time.  In the case of Andromeda, which is about 2.5 million light years away, it'll be somewhere around 4 billion years till it reaches the Milky Way because it is moving towards us at tiny speed compared to the speed of light.