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Astronomy - Galaxy 30 Billion Light Years Away
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I cannot get my head round an article today saying they've found a galaxy that's 30 billion light years away. If the universe started 13.5 billion years ago and, say that's when light set out on its way to us - how can it be further away than the time it's taken for its image to get here? Somebody explained that this is because the universe is expanding, so how can we see something that's further away than the time taken for its light to reach us? I can't seem to understand this at all. Please help!!
Answers
As has been pointed out, light-years are measurements of distance, not time. We might now be seeing light from a galaxy that has taken, say, 10 billion years to get here. If the Universe was static, that would indeed tell us that the distance to that Galaxy is 10 billion light-years. However the Universe is expanding, so we need to calculate how much further...
21:44 Thu 24th Oct 2013
I still don't like this business about the "sudden, very rapid expansion phase". It reeks of fudge factor and I vaguey recall something about it being to do with a specific problem they had getting their equations/extrapolations to work out in the way they wanted.
All way over my head, of course but I always take that bit with a pinch of salt and eagerly await the next round of discoveries.
All way over my head, of course but I always take that bit with a pinch of salt and eagerly await the next round of discoveries.
@mushroom
what gets me about the religious types is how insecure they are about having just one chapter of their book proved to be invalid, as if it causes the whole of the rest of their faith to unravel.
Gawd help us if the archaeologists start coming up with discoveries which prove the bible is shaky on its recording of historical events as well... ;-)
what gets me about the religious types is how insecure they are about having just one chapter of their book proved to be invalid, as if it causes the whole of the rest of their faith to unravel.
Gawd help us if the archaeologists start coming up with discoveries which prove the bible is shaky on its recording of historical events as well... ;-)
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