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So, I'm not too physics savvy but I am curious to ask. Is there a finite amount of mass in the universe? or is there more and more being created from somewhere or something? If the universe is infinite, and there's a finite amount of mass, that just seems kinda weird I guess.

Hopefully this isn't too dumb a question...

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marked as duplicate by Ben Crowell, Emilio Pisanty, David Z Aug 22 '13 at 1:04

This question was marked as an exact duplicate of an existing question.

This question is a duplicate of the one linked to by Qmechanic, and none of the answers given here are correct. – Ben Crowell Aug 22 '13 at 0:26
GI don't know why so many people think that the universe is "infinite". It depends on what sense you talking in. There are currently two possible endings of the universe. A big crunch or an ever expanding universe (this one has two sub possibilities). If you say that the universe will expand infinitely, then the universe can be infinite, but it will take an infinite time. But surely the matter in it will never be infinite. Not only will it take infinite energy, if it was infinite, the universe will have infinite curvature, and thus 0 size. – Udit Dey Apr 25 at 6:15

I would say that we don't know, and even have no clue, and the reason (beside the dark matter, energy/mass equivalence and other staff mentioned in the other answers) there is a very strange and mysterious thing which is Vacuum, we till now don't know exactly what happens there (and probably will never know) we know basically how do deal with it (more precisely how to get rid of it in our calculations) but still not sure about it's contribution to total amount of energy in the universe, and this despite that our universe is finite or note, because vacuum (although most physicists against this, but that depending on intuition only not experiment) vacuum may have infinite amount of energy, anyway that not very probable.

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The energy density of dark energy is known numerically to pretty good precision. – Ben Crowell Aug 22 '13 at 0:25

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