All Questions
10
questions
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73
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Are there any ways to conceptualize the relationship between gravity and space-time other than curvatures?
This might sound like a random question, but it came to me while I was trying to conceptualize the size of the universe and started thinking of entire galaxies resembling grands of sand floating ...
-3
votes
5
answers
213
views
Can some regions of space (independent of size), be completely devoid of matter?
Before answering the question, keep in mind that I am a second year Biology student, with no experience in studying Physics and a very basic understanding of Mathematics. However, I have some ...
- 69
-1
votes
1
answer
1k
views
Did gravity exist before the Big Bang?
Gravity is one of the biggest mysteries. It is the weakest of the 4 fundamental forces but we have no clue how it works. Einstein never was able to figure it out in his lifetime. There is evidence ...
- 129
2
votes
1
answer
510
views
Why doesn't the universe collapse under its own gravity?
Is the reason the universe doesn't collapse into itself due to gravity because there is an infinite amount of bodies in infinite space, therefore there is an infinite amount of gravitational pull on ...
- 21
1
vote
2
answers
914
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Is this a reasonable explanation for "the universe is finite but unbounded" which seems to be contradictory at first sight? [closed]
[Editorial note: I'm going to revise this question according to the suggestions made in comments and answers during the next few days. Thank you all for your valuable hints.]
There's the "ant on a ...
- 199
1
vote
3
answers
206
views
Can gravity transfer to the other side of the universe?
Since the speed of gravitational wave is limited by the speed of light, and a light can never transfer to the other side of the universe because it is expanding so fast. So does that means gravity ...
- 132
2
votes
1
answer
141
views
Is there, and if there is, what is the name of the concept that matter is made out of void/space?
I can't recall where I heard about this, but it was rather intriguing. I recall the notion that matter is compressed void/space, where I remember an example of a bedsheet representing space, and the ...
- 165
7
votes
4
answers
2k
views
What is space made of?
General Relativity posits that matter curves spacetime, such that geodesics point towards the object in question, hence, gravity. Now, how does matter do this? What is spacetime "made of", anyway, ...
- 193
2
votes
3
answers
3k
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Does gravity actually contract space-time?
In the Big Crunch Theory it says that gravity (curvature in space-time) will stop the universe's expansion and gravity will cause the universe to contract on itself. My question is if gravity is a ...
- 527
22
votes
5
answers
28k
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Stephen Hawking says universe can create itself from nothing, but how exactly?
Stephen Hawking says in his latest book The Grand Design that,
Because there is a law such as gravity, the universe can and will create itself from nothing.
Is it not circular logic? I mean, how ...
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