8.5 billion light years away, vs. ~100,000 light years across. To cover the whole galaxy, from a point source it would need to spread out just 1 part in 100,000

8.5 billion light years away, vs. ~100,000 light years across. To cover the whole galaxy, from a point source it would need to spread out just 1 part in 100,000. So, probably. Yes, technically our galaxy is a lot bigger than 100,000 ly, but the part somebody looking out from Andromeda could see isn't.