Special theory of relativity

Why spacetime is not fundamental

Now, we all know that spacetime is not fundamental, because physicists are saying so. But, do we know the reason why spacetime cannot be fundamental?

This is a physics question as well as a philosophy question.

If we say that X is a fundamental ingredient of the universe, then we will have to admit that whatever will exist in it, will need X for its existence. Nothing can exist without it.

However, if there is something in the universe that does not need X for its existence, then X cannot be called a fundamental ingredient of the universe.

Do time and distance really shrink to zero at light-speed?

So far as I can remember, there are these two equations in Einstein’s special theory of relativity:
l1 = l(1-v2/c2)1/2……. (1)
t1 = t((1-v2/c2)1/2……. (2)

From the above two equations, two conclusions can be drawn that are as follows:
1) Time and distance are not absolute, they are relative;
2) At light speed, both travel time and travel distance become zero.

For an extraordinary claim, there is extraordinary evidence

In one YouTube comment thread, someone has written: 'Furthermore, the concept of being spaceless and timeless is the same as not existing at all'.

God is said to be spaceless and timeless. As this is an extraordinary claim, so a shred of extraordinary evidence is required for it.

Happily, a shred of extraordinary evidence for it has been kept in nature for the non-believers in general by the creative force of the universe.

Was emergent spacetime fundamental at the beginning of the universe?

In one YouTube comment thread one atheist has remarked that it is really infuriating that all the apologist arguments that he has seen presented so far have ultimately failed to provide any proof for the existence of god. All their arguments are nothing but playing around with definitions of words and literally just throwing an explanation into the gaps of our knowledge, thus showing that every single god argument is essentially a god of the gaps argument, or that they feel good or special by being able to give that argument.

Is there any spacetime outside our universe

From special theory of relativity we come to know that matter and energy are equivalent. And from general theory of relativity we come to know that space, time and matter are interlinked and that there cannot be any space and time without matter. As matter and energy are equivalent, so we can also say here that there cannot be any space and time (or spacetime) without energy.

Dr. Sten Odenwald has provided the following information on behalf of NASA Astronomy Cafe, part of the NASA Education and Public Outreach program:

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