Linked Questions

6
votes
3answers
2k views

Can we prove that the universe is finite or infinite? [duplicate]

If I say that the universe is finite, how can you say with certain that I am wrong?
1
vote
0answers
689 views

What was the size of universe at big bang [duplicate]

While self studying cosmology as well as reading around I can't find a satisfactory answer to this question. My thinking is that in principle universe could have started already infinite or as a thiny ...
0
votes
3answers
642 views

Space and the size of infinity [duplicate]

If you could build a spaceship and keep travelling in one direction, what would finally happen? One answer is that you would never ever reach the end. But this sounds purely platonic space and comes ...
0
votes
1answer
256 views

Is the universe infinite? [duplicate]

Is the universe infinite? Or is it finite? If it is infinite,it's very difficult to imagine an endless space(though not impossible). But if it's finite, the idea that we can't go beyond a certain ...
1
vote
1answer
410 views

Do we have proof that the universe is finite? [duplicate]

I was just wondering if we have any proof at all whether the universe is finite or not. I have heard that it is indeed expanding - which could mean that it is possibly finite... is this true? or what ...
-2
votes
1answer
180 views

What is actually universe? only matter or both matter and space? [duplicate]

I have googled for the "meaning of universe" where I found the following: "all existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion light ...
3
votes
1answer
229 views

How could the universe be infinite (what is meant by that)? [duplicate]

I'd like to know what is thought of when saying the universe is infinite. I've read about what is meant when astronomers are speaking of a "flat" universe and I have read that its size is most likely ...
0
votes
0answers
28 views

Is universe infinite or not? [duplicate]

What do you guys think of Hawking's last paper "A Smooth Exit from Eternal Inflation?" https://arxiv.org/pdf/1707.07702.pdf according to him there's no such thing as infinite multiverses so he ...
14
votes
7answers
17k views

How can something happen when time does not exist?

I saw this documentary hosted by Stephen Hawkins. And if I didn't get it wrong, it says that there was no time before the big bang, time was created there. So how can anything happen when there is ...
21
votes
5answers
7k views

Does red shift evidence necessarily imply that the universe started from a singularity?

We are taught that the universe began as a singularity - an infinitely small and infinitely dense point. At the beginning of time there was a 'Big Bang' or, more accurately, 'Inflation'. The main ...
14
votes
3answers
13k views

Is the law of conservation of energy still valid?

Is the law of conservation of energy still valid or have there been experiments showing that energy could be created or lost?
21
votes
2answers
6k views

How can something finite become infinite?

How can the universe become infinite in spatial extent if it started as a singularity, wouldn't it take infinite time to expand into an infinite universe?
5
votes
4answers
1k views

The inner workings of the Olbers paradox

A long time ago I was told that the universe is finite. The provided "proof" (or reasoning), known as Olbers' paradox, was that on infinite universe there would be an infinite number of stars, and ...
8
votes
4answers
1k views

Is space unending?

Is the space unending, i.e it has no boundaries? If yes, how can a thing exist which is non-ending? Its impossible for me to imagine something like that. Secondly, if its not and has boundaries then ...
6
votes
1answer
572 views

Infinite number of galaxies?

I understand that the current estimate for the number of galaxies in the observable universe is about 100-200 billion. Is there anything in our understanding of physics and the evolution of the ...

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