If you could weight the whole universe would it ...?

Question

become heavier, lighter or would it keep its weight
while time passes.. ?

No doubt this would be impossible
but what if...

Answer 1

Theoretically, the universe is of finite mass. This theory has been validated several different ways, and so is considered "proven."
Matter and energy are interchangeable, and neither can be destroyed, just transformed from one state to another.
Because of this, the universe may change in any way imaginable, including size, but it will always contain the same mass.

Answer 2

Well, the stars are losing mass. The sun, for instance, a rather mundane dwarf star, converts hydrogen to helium and loses over 4 million tonnes every second.
Now, then, this mass is converted to energy, and while those photons are supposed to be massless, they do represent mass in energetic form, so if they stay in the universe, is the mass constant as a result? And what about all that dark matter and dark energy, are those changing over time? No one knows for sure. But the first approximate is that any specific part of the universe, like a group of star, should be getting lighter over time; provided that the gravity constant remains constant, which some theory say it could very well not be (constant, that is).

You did manage to pick up a very hard question, actually.

Answer 3

Well, according to the modern theory of a finite universe, the total weight of the universe should decrease over the eons as matter is converted into pure energy by stars and stellar explosions. Since pure energy has no mass, the net effect should be to make the universe lighter.

Answer 4

If all the positives (accelerations, mass, etc.) and all of the negatives (gravity, anti-matter, etc.) in the universe were added together, the result would be ZERO.

Answer 5

they can't even weigh earth pollution problem, and you're asking to weigh the universe as well?

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