All Questions
7
questions
1
vote
1
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49
views
Do expanding mass shells gain energy?
I've found an article which says in section 2
an expanding gravitational system of given mass gains energy
Does an expanding gravitational system or an expanding shell of a given mass gain energy as ...
- 2,462
3
votes
1
answer
120
views
Energy conservation in the Sachs-Wolfe effect
When energetic photons climb out of a potential well (eg Sachs-Wolfe effect) they lose energy. According to conservation of energy, where does this energy go? Into the gravitational potential making ...
- 928
0
votes
2
answers
488
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Is most of the energy in the universe potential energy?
So I asked a question about what would happen in regards to gravitational potential if I left earth and then vaporized it. The answer I got was that the Mass would still remain the same and even if ...
0
votes
1
answer
71
views
Does the energy density of the universe decrease when objects become gravitationally bound?
We know that the mass of an Iron nucleus is proportionally lower than the mass of a hydrogen nucleus (a proton) compared to the sum of the individual nucleons. This is due to the binding energy of the ...
- 1,720
2
votes
1
answer
529
views
What was the mean distance photons travelled before colliding with electrons in the matter plasma before recombination?
What was the mean distance photons travelled before colliding with electrons in the matter plasma before recombination?
I have checked other answers close to this but they only mention a mean ...
- 21
0
votes
2
answers
58
views
Is it possible to survive the destruction of a planet (earth)? [closed]
I recently watched Star Trek VI: The Undiscovered Country again. The main story evolves around the destruction of a moon of the klingon empire which is their main ...
- 109
4
votes
1
answer
1k
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Negative Energy in Inflation Theory (Low/Zero Energy Universe)
I've been reading Max Tegmark's book: Our Mathematical Universe. It's very interesting, but I wanted to know more about one particular thing. The book simplifies things and I know inflation theories ...
- 143