alright, i started a thread in this forum a while back about how if energy cant be created or destroyed then how could the universe have been created?

it got me thinking.
i am by no means an expert on things like this, i am just an 18 year old high school student going no where in life according to a few of my teachers, a guidance counselor, and the state of florida.

so if i sound like idk what im talking about, its because idk what im talking about.

ok, if it is true that energy can not be created or destroyed, then wouldnt that mean the the universe has always been here and always will be? if its not true that energy cant be created or destroyed, wouldnt that put a lot of holes in a lot of important theories?

and,
if it is true that energy can not be created or destroyed, and are universe has been and always will be, then wouldnt that make the universe an example of perpetual motion?

and if perpetual motion exists, wouldnt that also put a lot of holes in a lot of theories?


so either way, weather the universe has always been and always will be, or if it had a beginning and will have an end, then our theories are wrong.

is this right? or wrong?

also, when i say "the universe" i mean all of existence.


and remember, im just a highschool student so dont ask me what "theories" im talking about, because idk what they are called or what theories these things would effect.

but im pretty sure these things matter.

but also, can anyone recommend a website where i can learn about stuff like this so that i don't necessarily have to make a post about it?

like.. a "physics for dummies" type of website.

Energy is constant, however entropy is not. Entropy is what really makes perpetual motion impossible, since we have no way to decrease the amount of entropy in the universe.

Strictly speaking energy is not the ability to do work as you might have thought; we call that free energy. As a simplified example take a tiny universe filled with hot air. While the air is hot, and thus has energy, the entropy is at a maximum, and the hot air is unable to do work. Thus the free energy is at a minimum, and the universe is dead.

One of the arguments therefore that the universe can't have been around forever is that the universe hasn't reached maximum entropy yet.

What if symmetries were broken? Could entropy DEcrease?

No way that we know of. I think you can if you can somehow create more actual space maybe, however we don't know of any way to do so.