All Questions
8
questions
2
votes
1
answer
81
views
Amount of matter in two infinite universes [closed]
I don't know exactly where to find any other information on this question so I thought I would ask here. If there were two infinitely large universes one where 20% of the space in the universe was ...
- 21
3
votes
3
answers
204
views
Expansion of space or contracting of matter? [duplicate]
Can the expansion of the Universe effect be explained by contraction of the overall matter instead? That is, all material objects are in fact contracting, due to what the universal space seems (and ...
- 31
0
votes
1
answer
613
views
As space expands does the density of matter remain same or increase? [duplicate]
I learned that space is always expanding. Even between sun and earth, it's just gravity is stronger.
Imagine space as graph paper and there is a square object that fills it.
Space expands, 1x1 cell ...
- 2,645
0
votes
0
answers
55
views
Space expansion and conservation of energy [duplicate]
The phrase of 'expansion of universe' , as we are led to believe, is mostly referring to an expansion in space. But is space expanding in the sense that the space between two particles is increasing ...
- 126
1
vote
1
answer
756
views
How does mass affect the expansion of space?
I'm a layman and I'm curious to understand how mass affects the expansion of space and whether the expansion of space is uniform everywhere in the universe.
From looking at redshifts it seems we have ...
- 11
12
votes
2
answers
2k
views
What is the physics definition of space?
When astronomers, physicists say that space is expanding, does the definition of space include matter, energy and the particles within?
Or is space an empty 'stage' in which all of the above exist?
...
- 11.7k
0
votes
2
answers
259
views
Don't rulers expand at the same rate as the universe they measure? [duplicate]
If you placed a giant ruler between the sun and our nearest star for example, wouldn't the divisions on the ruler expand at the same rate as the universe - therefore maintaining a constant distance? ...
- 7
3
votes
1
answer
567
views
What is the difference between matter & spacetime? [duplicate]
If the universe is expanding why doesn't the matter in it expand proportionally making it seem as if the universe is static? Alternatively, as spacetime expands why does it not just slide past matter ...
