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Originally posted by stumason
So, assuming still that the stars (for arguments sake) don't speed up or slow down, but travel constantly, Astronomers are just plonking them on a map based solely on their relative distance from Earth, not taking into account their motion or the amount of time the light has taken to reach us?
You have not answered my question on wether anyone has actually taken into account distance for the light to travel, and motion of the body during the time it has taken the light to travel to earth
But, back to my point, because we use that same type of measurement with all calculations (to form the picture), the picture is accurate.
understand the mechanics behind measuring the universe, what I do not know is wether the map of the Milky Way (or whatever) is a picture of now, then or a combination of "thens", as each stars light has taken a different amount of time to reach us.
We will just ignore the stated fact that everything is apparently moving away from everything else, and draw a map of a static galaxy."
That would be different, as the stars further away would have had greater opportunity to change their apparent positions in the time it takes for light to travel to us, more so than the stars that are closer
We're going to have to do some re-caculations when we finally figure out Interstellar travel
Originally posted by Ignorance Is Bliss
I mean I know andromeda is moving closer but from what I read on nasa they said that we will pass right through eachother
Result is propably massive elliptical galaxy which are in centers of most galaxy groups. (where collisions have happened most often)
Originally posted by SpookyVince
It may be an irregular galaxy, a perfectly spiral one, a new elliptical, noone can tell, but the whole merging process is something that will anyway take years and years, that will trigger events within both of the galaxies (events of the kind of novae, supernovae, star birth,...).