(April 4, 2014 at 1:57 pm)Fromper Wrote:(April 4, 2014 at 1:36 pm)archangle Wrote: thats right.
They don't know yet. They are still looking. They aint even sure that those galaxies so far away aint our own milky way 10 billion years ago.
remember they know less than 10% of the stuff out there. Everything we know is a human perceptive only.
Ok, the statement I bolded kinda blows my mind. I had assumed we couldn't look back at our own galaxy at an earlier time, because the rate of expansion of the universe has to be slower than light, so the light from our own galaxy 10 billion years ago would have reached our current point in space before we did.
But the idea that the curvature of the universe would allow us to look back at our own galaxy from the opposite direction of the one we took to get here during universal expansion hadn't occurred to me. But if that were the case, wouldn't that make the universe smaller than expected, since we'd be seeing the same part of space when looking really far away in two opposite directions?
It is a cool thought, and an absolutely valid idea and question, but it has been addressed and is ruled out observationally. The current bound on the radius of such a recurrence is several times the visible horizon. If
The fool hath said in his heart, There is a God. They are corrupt, they have done abominable works, there is none that doeth good.
Psalm 14, KJV revised edition
