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[–][deleted] 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (9 children)

Either the physical universe is a closed system or an open system. If it is a closed system, it couldn’t be eternal because of the heat death paradox, and so it had a beginning. If it is an open system, it’s eternity is explained by something outside it supplying energy so it doesn’t die a heat death.

Either way we look at a complete explanation for the physical universe resides outside itself.

https://en.wikipedia.org/wiki/Heat_death_paradox

[–]Hel 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (8 children)

Not being able to explain something about the universe will never prove there is something outside the universe. That’s a classic argument from ignorance.

https://en.m.wikipedia.org/wiki/Argument_from_ignorance

[–][deleted] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (7 children)

Learn logic dude. That was a reductio ad absurdem. That was also a dilemna. Might I recommend the book Socratic Logic?

[–]Hel 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (6 children)

a complete explanation for the physical universe resides outside itself

This conclusion to your reductio ad absurdem is the argument from ignorance, so we can conclude you made a mistake somewhere. How long is it going to take you to reread Socratic Logic?

[–][deleted] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (5 children)

The Laws of Thermodynamics shows that our universe can only be eternal if energy is added somehow. And if it is not eternal it had a beginning.

Do you believe the laws of thermodynamics don’t apply to this universe?

[–]Hel 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (4 children)

ELI5 why The Laws of Thermodynamics require the heat death of the universe.

[–][deleted] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (3 children)

Only in a closed universe where energy is conserved. If it a closed physical system eventually it would reach thermodynamic equilibrium no matter how many times it goes bang, or whether it doesn’t go bang. It can be eternal if it is an open system.

[–]Hel 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (2 children)

At the moment the observable universe is expanding and thus cooling. However the observable universe is uniform, so if said uniformity continues sufficiently outside of the observable universe then the observable universe is necessarily contained in an event horizon. Thus eventually everything will move back towards the origin which will cause warming. Since energy is conserved this cycle of expansion and contraction can be eternal.

[–][deleted] 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (1 child)

If we imagine it like an simple harmonic device where there is no friction I suppose it could work.

So the universe for all eternity is not in equilibrium and continues to oscillate to reach equilibrium?

[–]Hel 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

It’s not that there is no friction, but rather that the friction just generates heat which is then “absorbed” into the singularity/ringularity, along with all the other energy/mass, until it reaches “critical mass”.