I personally get that this would be the mainstream secular scientific idea > the earth has to cool down, eventually, due to thermal principles.
But the Bible says things will end in fire . . . not very cool, then. 2 Peter 3:10 >
"But the day of the Lord will come as a thief in the night, in which the heavens will pass away with a great noise, and the elements will melt with fervent heat; both the earth and the works that are in it will be burned up." (2 Peter 3:10)
People have different ideas about what this really means; so talking about this theologically can get wild, indeed.
I think it could be either way . . . limited or infinite . . . whether God decided or not. My opinion is it is limited, in any given location, like the earth. The earth has limits. But does the universe exist without spacial end out in all directions? I believe God has not outer boundary of Himself, and so it is possible He has creation to no end in any direction from us. But where we are there are limits > even the sun is believed to be able to produce light and heat for only so long.
I think so. God is in all-management of all. So, yes. But there are Bible claiming people who disagree with this. I think control is an ego problem; and so ones can be very upset at the possibility how God really is the One in control of everything.In any case, He created it. But, scientifically, it is possible for energy to be limited in amount and still function wherever it is. But it seems that forms of energy can keep on being energy . . . like how sunlight energy can be captured by a green plant and stored in sugar and then something can eat that sugar and use its energy, then that energy can be captured in coal or oil for a long time, but then a fire can turn that energy loose, which was sitting in that cold coal or cold oil, but always was ready to act in a hot way. So, scientifically, to me, this shows energy can continue. But if it burns away from, say, coal, then you might have no way to capture it, again; but it is somewhere, I would say.
It seems if the energy just goes into the air, it can get lost from humans keeping track of it. But if energy is captured and held in molecules, it can stay a while because atoms and molecules do not seem to break down. So, it depends; it's interesting.