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Results tagged with space-expansion
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user 26918
The expansion of the universe is a phenomenon wherein, at scales much larger than galaxies, the distance between objects grows over time. This phenomenon is often described as "expansion of space", although there is no difference between space expanding and objects moving apart.
1
vote
How do we observe the expansion of the universe?
There's an old theory called "tired light" where the momentum is lost due to waves hands some other reason, but as far as I'm aware this has been pretty much discounted these days.
The background beh …
- 498
0
votes
What are we all falling towards?
You've kind of got a point with "every object in the universe is either orbiting something or it is falling towards something", but the language you use is going to make physicists twitch uncomfortabl …
- 498
7
votes
Why is the observable universe so big?
You can travel as close to the speed of light as you want, but (assuming you're made from matter) you can't travel at the speed of light or faster.
So there's no reason why galaxies can't be receding …
- 498
0
votes
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 …
- 498