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Results tagged with universe
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user 26918
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
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A question about multiverse
It's really easy to say that "what's outside the universe" is a nonsensical question ("where do you go if you walk to the north pole and keep going north?" …
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How do we observe the expansion of the universe?
Hubble discovered this "red-shift" (frequently referred to as the "Z value" or just "Z") obeys a linear relationship with distance, suggesting the entire universe is expanding at a steady rate. … Later work showed that this isn't 100% correct, the expansion is actually accelerating (the "Dark Energy" problem), but the general interpretation of red-shift as a sign of an expanding universe is still …
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Why is the observable universe so big?
The universe isn't actually expanding as you'd expect from everyday life, as a explosion would, and there wasn't a "single point" that you can point to and say "that's where the big bang happened", it …
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Does the expanding universe prove the theory of relativity wrong?
Short answer, no.
Relativity "forbids" massive matter moving at (or faster than) the speed of light within spacetime, but the recession of distant galaxies is due to the expansion of spacetime itself …
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Where does the matter and energy go in a black hole?
Anything astronomically observable to us probably has an evaporation time of many times the age of the universe, in the hundred of billions of years and upwards.
But they do evaporate. …
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