Can we prove that the universe is finite or infinite? If I say that the universe is finite, how can you say with certain that I am wrong?
 A: George Gamow tried to explain the origin of the Elements Georges Lemaître's theory of the expansion of the Universe. He proposed a ball of neutrons exploding as the Big Bang,nucleocosmogenesis. http://en.wikipedia.org/wiki/George_Gamow  Alpher and Robert Herman predicted that the afterglow of the big bang would have cooled down after billions of years, filling the universe with a radiation 5 degrees above absolute zero. Alpher and Herman's prediction in support of the big bang was not substantiated until 1964, when Arno Penzias and Robert Wilson made the accidental discovery, for which they were awarded the Nobel Prize in Physics in 1978.The universe was once very hot and dense, and the photons and baryons formed a plasma. As the universe expanded and cooled, the radiation (photons) decoupled from the matter. The radiation cooled and is now at 2.73 Kelvin. http://aether.lbl.gov/cmb.html
A: Due to General Relativity the universe started 13.7GYr ago. It was finite then and since there was no phase of infinite expansion, it is still finite. 
A: If the universe is infinite, there would be an infinite amount of stars in it, therefore there will be no night and we have to sleep in Sunglasses.
