Is energy conserved in an expanding universe?
2377
Is the total energy of the universe zero?
29728
Does the vacuum in QFT have nonzero energy or not?
22682
If everything in the universe doubled in size overnight, would it be noticeable?
44566
Is (rest) mass conserved in special relativity?
90716
Conservation of energy and wavefunctions
86806
When you lift a box from the floor, the potential energy changes but kinetic energy does not change. Does it violate conservation of energy?
58042
Redshifting of Light and the expansion of the universe
45625
Is energy content of a system different depending on the observer?
26753
How long will the Universe's hydrogen reserves last for?
39654
When they say that the universe cooled after the big bang, where did the heat go?
113662
What does the 'cosmological constant' represent?
49047
Redshifted Photon Energy
50876
Is space expanding equally in every direction?
111390
Size of Universe after inflation
139471
What if the size of the Universe doubled?
10362
Does the universe have a center?
67531
Universe being flat and why we can't see or access the space "behind" our universe plane?