Jul 11th 2017, 10:00 PM
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Originally Posted by wad Whether we regard the universe as a expanding sphere or the surface of an expanding balloon, as, starting with the beginning of time, all spherical stellar masses in the universe emit photons (electromagnetic energy) in every direction, more than half of all photons are being irreversibly sent outward beyond the edges of the universe - such edges defined the last radii where masses exist. Does this mean that the universe will die from total dispersion of its energy as photons? |
You need to be careful talking about "edges" for the Universe. Due to the speed of light and the generally accepted Big Bang model we can only observe phenomena 13.5 billion light years away. (Actually less than that but that's a topic for another time.) So the Universe may not have a boundary.
Now, if photons are leaving our "bubble" then symmetry would seem to demand that any radiation that might leave us then there will also be photons entering from another bubble. Not much evidence for this though, for or against.
There are a lot of possible stages here. I'll skip over the details as I know them (another topic for another time) and say that, yes, unless we have a Big Crunch the Universe will be filled with a radiation field growing ever colder as the Universe keeps expanding.
-Dan
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