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Originally Posted by Zthatsme
If the light from a star at the edge of a galaxy takes, lets make it easy, 100,000 years to get to the other side of that galaxy and that star is traveling both with and within that galaxy, how is it possible for that light and the light of a star on the opposite side of that galaxy to reach a camera lens on earth at the same time? In other words, shouldn't we see star(a) in a different position relative to star(b), say about 100,000 years worth, then what we see when we look at a picture. For that matter, is any picture that's taken of any part of the universe really what's out there?...Z
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I'm not sure exactly what you are trying to say. All I can is that the light that hits your eye is the same light that hits the camera.
An example would be the light from a star 2 billion light years away. The light is travelling at 3 000 000 km/second and took 2 billion years to reach earth.
So:
60seconds * 60minutes * 24hours * 365 days * 2billion years
= 63 072 000 000 000 000 seconds
63 072 000 000 000 000 seconds * 3000000km
= 189 216 000 000 000 000 000 000km from earth
So a star at this distance will be seen on earth 2 billion years after the light was sent.
We can calculate the approximate location of where the star would be at the present time. This is a rather complicated process though.
Hope this helps.
Damien
