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Author Topic:   Question About the Universe
Michamus
Member (Idle past 5147 days)
Posts: 230
From: Ft Hood, TX
Joined: 03-16-2009


Message 18 of 373 (507029)
05-01-2009 5:29 AM
Reply to: Message 17 by GDR
04-30-2009 5:48 PM


GDR writes:
It seems to me that seeing as how, (as you say, if we have everything right), that what we are seeing is something that is as far back in time as it is possible for us to view.
It as far back as we are able to view currently.
GDR writes:
We are viewing it as it was 13 billion years ago.
Not necessarily, as bluejay posited, it is possible that the expansion of spacetime at sub-light speeds would increase the amount of time it would take for the light to reach us.
Think of it like trying to throw a football to your friend who is running away from you, while you are running backward. It will take the ball more time to reach your friend, than it would if you were simply both stationary.
GDR writes:
Does this mean then that from our perspective there is no part of the universe that we can't view
No, it doesn't mean that, unless we were at the center of the universe, which we already know we aren't from red shift. Heck we aren't even the center of our galaxy.
Using basic geometry, we can determine that anything beyond the "center of the universe" (if there is even one), cannot be seen, as the light is still in transit to us, due to the fact that the universe is younger than the distance any object beyond the center of the universe is from us. That is, if we are 13.7BLY away from the center of the universe.
Edited by Michamus, : diagram didn't show like i wanted it to

This message is a reply to:
 Message 17 by GDR, posted 04-30-2009 5:48 PM GDR has not replied

  
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