japetus
Well-known member
Do you think it's possible? What would it take to prove to you that it was real?
jaxadam
Well-known member
I don’t think it’s possible. There’s a very good book by physicist Carlo Rovelli called “The Order of Time”. Thermodynamically, entropy only allows for the arrow of time to point in one direction.
But don’t let that discourage you…. In the LQG world (loop quantum gravity), Carlo posits times doesn’t even exist at all!
https://www.amazon.com/Order-Time-C...ocphy=9011569&hvtargid=pla-455191460063&psc=1
But don’t let that discourage you…. In the LQG world (loop quantum gravity), Carlo posits times doesn’t even exist at all!
https://www.amazon.com/Order-Time-C...ocphy=9011569&hvtargid=pla-455191460063&psc=1
Monkey Man
Super Moderator
I've always felt that it doesn't exist; it's an invention we use to help us quantify and understand our linear experience of events.
As jax pointed out, entropy trumps all attempts to thwart it and moves in one direction only. Perpetual-motion machines will never work due to this. There's no such thing as a 100%-efficient transfer of energy, and therein lies the catch. It never ceases to amaze me, the lengths peeps will go to to try to circumvent this unbreakable law via their attempts at such machines.
So yeah, I wouldn't worry about the possibility of time travel Mr. B; leave that to Star Trek et al.
As jax pointed out, entropy trumps all attempts to thwart it and moves in one direction only. Perpetual-motion machines will never work due to this. There's no such thing as a 100%-efficient transfer of energy, and therein lies the catch. It never ceases to amaze me, the lengths peeps will go to to try to circumvent this unbreakable law via their attempts at such machines.
So yeah, I wouldn't worry about the possibility of time travel Mr. B; leave that to Star Trek et al.
Monkey Man
Super Moderator
For those who're scratching their heads about this entropy thing:
Everything's falling apart, breaking down, corroding / rusting, cooling down, slowing down... IOW, tending towards disorder and ultimate heat death (where all temperatures have equalised).
To reverse time would mean you'd have to be able to unscramble the proverbial egg / reassemble something that's been smashed to smithereens or rusted to dust without even taking any (forward) time to do it, 'cause to travel back would mean that all these breaking-down events would magically have to repair themselves. Not going to happen.
Everything's falling apart, breaking down, corroding / rusting, cooling down, slowing down... IOW, tending towards disorder and ultimate heat death (where all temperatures have equalised).
To reverse time would mean you'd have to be able to unscramble the proverbial egg / reassemble something that's been smashed to smithereens or rusted to dust without even taking any (forward) time to do it, 'cause to travel back would mean that all these breaking-down events would magically have to repair themselves. Not going to happen.
japetus
Well-known member
jaxadam
Well-known member
I've always felt that it doesn't exist; it's an invention we use to help us quantify and understand our linear experience of events.
As jax pointed out, entropy trumps all attempts to thwart it and moves in one direction only. Perpetual-motion machines will never work due to this. There's no such thing as a 100%-efficient transfer of energy, and therein lies the catch. It never ceases to amaze me, the lengths peeps will go to to try to circumvent this unbreakable law via their attempts at such machines.
So yeah, I wouldn't worry about the possibility of time travel Mr. B; leave that to Star Trek et al.
Another problem is, depending on how far back in time you go, the Earth isn't going to be in the same place!
Monkey Man
Super Moderator
Yup, the location problem is a big one.
What's to say you wouldn't end up in space, embedded in a mountain of granite or 4 miles deep in an ocean?
As we know, only a small portion of the planet is comfortably-habitable for us, and you'd have to be extremely-lucky to land on earth considering its year-long flight path 'round the sun, not to mention the rotation variable.
What's to say you wouldn't end up in space, embedded in a mountain of granite or 4 miles deep in an ocean?
As we know, only a small portion of the planet is comfortably-habitable for us, and you'd have to be extremely-lucky to land on earth considering its year-long flight path 'round the sun, not to mention the rotation variable.
japetus
Well-known member
You drop in highYup, the location problem is a big one.
What's to say you wouldn't end up in space, embedded in a mountain of granite or 4 miles deep in an ocean?
As we know, only a small portion of the planet is comfortably-habitable for us, and you'd have to be extremely-lucky to land on earth considering its year-long flight path 'round the sun, not to mention the rotation variable.
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