All Questions
7
questions
0
votes
1
answer
46
views
Average Time since the Big Bang
Can we define an average time for the entire universe relative to the Big Bang and call this the universal time since the beginning of the universe? (time, averaged relative to all possible reference ...
- 613
3
votes
1
answer
96
views
Are questions about "when" an event outside the visible universe occurred meaningless?
It seems to me that the answer is yes, first of all because it is impossible in principle to use Einstein's definition of simultaneity in such cases since signals cannot pass from the event to us, and ...
- 290
20
votes
8
answers
13k
views
What is spacetime (simple explanation)? [duplicate]
Can someone please explain concept of spacetime in simple language? What is it and how it is important in the universe?
Wherever I have tried searching this concept, I have come across most ...
- 311
0
votes
2
answers
125
views
Scenario of Crossing the speed limit of our Universe [duplicate]
One of Important conclusions of Einstein's Theory of Relativity is that we cannot cross or break the speed limit set by the laws of physics that is the speed of causality
consider this scenario:
...
- 290
1
vote
2
answers
540
views
Trouble understanding spacetime and invariant interval
First, how is the invariant interval useful? How can it help us understand things around us in the universe?
Second, I know that they changed time into space or better say SPACETIME in order to ...
- 736
0
votes
1
answer
118
views
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
8
votes
1
answer
499
views
Our Universe Can't be Looped? [duplicate]
With reference to the Twin-Paradox (I am new with this), now information of who has actually aged comes from the fact that one of the twins felt some acceleration. So if universe was like a loop, and ...
user23503