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Questions tagged [universe]

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The universe refers to the cosmos; all of space-time and that which exists as part of it. Alternatively, it can refer to the observable universe, which only contains the part we can see. Questions tagged with this should ask about physics at scales the size of the universe or specific properties of the universe

1,845 questions
Newest Active Bountied Unanswered
Score of -5
2 answers
128 views

Could something outside the observable universe travel faster than light? I understand that within our observable universe, nothing has been measured traveling faster than light in a vacuum. But since ...
Score of -4
0 answers
50 views

I don't know [just in case I know the universe is expanding, I want a more detailed answer]
Score of -5
0 answers
76 views

In modern cosmology, the Hubble-Lemaître law provides robust empirical evidence that the expansion of the universe accelerates with distance. Rather than postulating an elusive "dark energy" ...
Score of -9
1 answer
157 views

I'm a home school teacher and trying to figure out how to explain this to my son. I know the sun rising and setting is from the earth spinning but I havent been in school long enough to remember if ...
Score of 3
5 answers
918 views

I am not a physicist. In the block universe model how does causality work? If all timeframes are equal. Surely the cause has to come before the effect and so on therefore causing a string of causality?...
Score of -3
1 answer
114 views

I was studying about the big bang theory it says that "At early there is nothing and then big bang occur and at first there was only energy, hydrogen, and helium and then over time, gravity ...
Score of 5
1 answer
760 views

Imagine that there is a universe with no gravity ($G=0$), and the spacetime is perfectly flat. Suddenly a “fireball” emerges from a point and expands at the speed of light. This fireball is made of a ...
Score of 0
2 answers
118 views

I recently came across the concept of nature's tendency to always change itself to stay in the least energy state possible. But I don't quite understand one fact that, we know law of conservation of ...
Score of -7
1 answer
196 views

What is infinity? It's a human invention. There is nothing in the physical world that we can point to and say: "This is infinite". And if there were, it is not certain we could prove it by ...
Score of 1
0 answers
185 views

I frequently read everywhere that the whole universe is considered or even defined as an isolated system (in the usual thermodynamical sense), since it encloses everything that there may be, and that ...
Score of 4
1 answer
257 views

Contrary to the popular depiction of universe as dots on the surface of an inflating balloon, the universe at large scale looks like a web. The picture of uniformly scattered dots doesn't capture this ...
Score of 0
1 answer
99 views

Is there another relationship between the amount of energy lost by photonic stretching and Dark Energy (besides expansion)? Are there any current theories that allow for those two energies to ...
Score of 2
0 answers
114 views

In the very first paragraph of Godel's 1949 paper (PDF), it is stated that It is easily seen that the non-existence of such a system of three-spaces is equivalent with a rotation of matter relative ...
Score of 0
1 answer
250 views

In current theories of physics, space and time are normally described as a continuum (like $\mathbb{R}^{4}$ or some other continuous manifold). Taken literally, this implies that there's no such thing ...
Score of -10
1 answer
187 views

All theories related to quantum mechanics, detailed information of string theory, And a consideration that every thing exists in all dimensions.

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