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/sci/ - Science & Math

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5633296 No.5633296 [Reply] [Original]

Guys, I've heard that time began at the big bang and did not exist. What does that mean? What is our marker for knowing time is occurring i.e. how do we tell that time is happening? Thanks /sci/

>> No.5633301

*Did not exist before the big bang.

>> No.5633309

It doesn't mean anything other than that Stephen Hawking a shit.

>> No.5633310

>>5633296
>how do we tell that time is happening?
Change occurs.

>> No.5633314

>>5633310
that seems to imply the big bang was spontaneous and random

>> No.5633316

relativity tells us time and space are in a sense inseperable. hence the beginning of space would be the beginning of time.

of course, you should take this with a rather large grain of salt considering we have no knowledge whatsoever about the process behind the big bang itself.

>> No.5633325

>>5633316

which is silly because current theory doesn't say anything about the universe creating space, just that it's expanding to encompass more space

>> No.5633330

>>5633310
Change as in entropy? Because you could be in a quiet room with nothing in it and there would be no "change" and so time would have, by your definition, stopped.

>> No.5633334

>>5633330
Assuming you're a human being, change would be occurring in your body. Blood would be flowing and so on. Assuming the temperature is not 0 Kelvins, molecules in the room would be moving.

>> No.5633335

>>5633325
the idea is something along the lines of extrapolating it backwards and concluding that it started as a point. of course, this is terribly naive, but there you have it.

>> No.5633336

>>5633330

you're trying to describe a closed system in which the net entropy is 0, and that can't happen

>> No.5633357

Sorry guys, but the ignorant, yet curious me asks, how come we can't get 0 entropy. Does it have to do with the Planck laws and all that reducing the temperature to 0 Kelvin which means 0 entropy, we would have 0 matter (nothing)?