- #1
kleinma
- 92
- 0
Ok I was thinking about this the other day...
When telescopes like Hubble look at distant galaxies, it is really seeing them how they were x amount of millions/billions of years ago because that is how long it took for the light from those galaxies to reach the telescope.. Right?
Now if the universe is expanding, and said galaxies are moving farther away from us, then are we getting images of where the galaxy used to be? or where it is now? How does that work? Do we plot where these galaxies are in relation to where they are in the telescope shots we get? Or in relation to where we believe they are now (based on our estimated speeds of the expanding universe, and the speed the galaxy is moving away from us..
Also, If the universe started with a big bang, and was tiny and has been since expanding... looking back in time should show a smaller universe (i know we haven't seen an "end" of the universe.. but theoretically, shouldn't everything from billions of years ago that we see how be a lot closer together??)
oww my head hurts
someone clear this up for me??
When telescopes like Hubble look at distant galaxies, it is really seeing them how they were x amount of millions/billions of years ago because that is how long it took for the light from those galaxies to reach the telescope.. Right?
Now if the universe is expanding, and said galaxies are moving farther away from us, then are we getting images of where the galaxy used to be? or where it is now? How does that work? Do we plot where these galaxies are in relation to where they are in the telescope shots we get? Or in relation to where we believe they are now (based on our estimated speeds of the expanding universe, and the speed the galaxy is moving away from us..
Also, If the universe started with a big bang, and was tiny and has been since expanding... looking back in time should show a smaller universe (i know we haven't seen an "end" of the universe.. but theoretically, shouldn't everything from billions of years ago that we see how be a lot closer together??)
oww my head hurts
someone clear this up for me??