All Questions
7
questions
1
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1
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326
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Is the center of the universe at absolute rest? [duplicate]
A twelve year old relative of mine asked me: If after there is a center of the universe (maybe the center is the point where the bigbang happened), could it be at absolute rest? Because everything is ...
- 111
1
vote
0
answers
38
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What does it mean by "the age or our universe"? [duplicate]
I am always puzzled by the notion "the age of our universe" because, correct me if I am mistaken, the universe is the entirety of the spacetime. So how can we measure how much time has the entire ...
- 11
3
votes
1
answer
527
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Is any reference frame truly inertial?
I'm aware of the potential duplicate question here. However, that question centres on the Newtonian argument of there being a force, and hence acceleration. However, my issue is with the expansion of ...
- 1,788
0
votes
1
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118
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Could this be a valid reason for why the universe could be infinite?
So, special relativity says that every frame is as good as any other frame, and there is no absolute frame of reference. All good.
Suppose there is a finite universe (let's just assume the universe ...
- 1,028
7
votes
1
answer
903
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Doesn't dating the universe violate the concept of spacetime's inseparability?
It would seem that measuring an age of the universe from the big bang requires separating spacetime into a 3D coordinate system and a time track. I fail to understand why it is appropriate to take ...
- 121
8
votes
1
answer
755
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What coordinate system is used to describe planets positions in the universe?
How are planets positions described in the space and in respect to what?
For example is Sun the reference point and right now at this moment, the Earth has coordinates X, Y and Z?
Edit1:
I found ...
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4
votes
2
answers
355
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Since the universe is expanding, does anything ever occupy the same point in space?
Let's say we can observe expansion in a supercluster.
We define origin of our frame of reference at the center of the supercluster.
We observe an object/atom at point A at time T. The object is ...
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