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adrian1
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How do we know that the time had a beginning?
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Maximilian75
Guest
what do you mean by ‘The Time?’
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Kei
Guest
Time and space are intrinsically connected.
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upant
Guest
we don’t. we assume the big bang was the beginning.
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Luke6_37
Guest
Einstein’s equations.
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AlNg
Guest
How do Einstein’s equations prove that time had a beginning? I don’t see it.
No. I don’t see that either. The real line goes back as far as you want and yet there still is a zero point and a point for +1.
We are here now at a particular point in time 2018 AD but there is no limit to how far we can go back , except possibly at the Big Bang. But according to some theories there was a universe before the BB which had collapsed and subsequently formed the BB of 14 billion years ago. The cyclic theory of the universe postulates a never ending cycle of BB’s and subsequent Big Crunches. Recent efforts have been made to overcome the various objections to it.
As far as philosophy is concerned one way to overcome the objections to physical infinite regression in time is to assert that the only thing really physically existing is NOW. The past did exist, but does not exist now. And the future will exist but does not exist now. As you step back into the past, you are always stepping back from the NOW point, but there is no limit on how far you can step back into the past, assuming that the universe existed before the BB.
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ratio1
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So do you think it is irrational to believe time will go on infinitely? Ie it is ONLY rational to think that time will end at some point?
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Luke6_37
Guest
I am not a physicist, but according to Einstein’s equation time, matter and energy are all relative with respect to one another. For example, time stops for an object moving at the speed of light, and its mass becomes infinitely large. That is why only objects without mass (e.g. photons) can move at the speed of light.Luke6_37:
How do Einstein’s equations prove that time had a beginning? I don’t see it.
Time is not constant. It is relative depending on how fast you are moving. The faster you move, the slower it goes. “Prior” to the big bang there was no space, no mass & no time.
See Albert Einstein’s special-relativity equation E=mc2.
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AlNg
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Luke6_37
Guest
Scientists conducted experiments to test whether the equation accurately reflects measured reality, and it does. I believe they placed atomic clocks on jet planes a flew them around the earth. When the planes landed, the clocks showed that less time had passed for those in the sky than for those that remained on earth.
Once you prove that the theory is fundamentally sound, the rest can be logically derived from it.
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Kei
Guest
Purely from a philosophical point of view, if time never began, then we’d never get to me typing this, as there’s an infinity of time to get through before anything happening.
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Rhubarb
Guest
Our observations about space and time (which are the same thing) all indicate that there was a beginning
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AlNg
Guest
True, but that doesn’t prove that time had a beginning?
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AlNg
Guest
I don’t see how observations indicate that there was nothing before the BB?
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Luke6_37
Guest
You can replay time back to the point of singularity but no further. That is how Georges Lemaître figured it out in the first place.Luke6_37:
True, but that doesn’t prove that time had a beginning?
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AlNg
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Assuming the BB did happen does not prove that there was nothing before the singularity.
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Luke6_37
Guest
I believe there was something before the singularity, but that something would necessarily have to be timeless, immaterial, and supernatural - like God.Luke6_37:
Assuming the BB did happen does not prove that there was nothing before the singularity.
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