Science!

**Marie Monday** · 02-08-2019, 02:24 PM

Quote:

Originally Posted by grindy

Special relativity is an endless source of fun paradoxes

OccultHawk · 02-08-2019, 03:08 PM

Quote:

Originally Posted by MariaExpressesHerself

Special relativity is an endless source of fun paradoxes

It’s an incredible mind ****.

Also from the video he says it so quickly but the speed we’re traveling when it’s measured as our solar system relative to the massive black hole in the center of the Milky Way is crazy af

**Marie Monday** · 02-08-2019, 03:29 PM

You're right, google says 1/1300 of the light speed, I didn't know it was that fast. Crazy how we don't even notice

**Marie Monday** · 02-09-2019, 03:02 PM

Another weird thing to break your head on, which I've asked several lecturers but never got a clear answer on:
When you compress any amount of mass within a small enough volume, you get a black hole. Nothing then can escape this black holes event horizon. Because the universe strated out infinitely small and then expanded, it seems true that at least at some point after the big bang the matter of the universe was compressed enough to meet the black hole criterium. So how could it expand? Were there mainly photons (which are massless) when the universe was small? Or do we live inside a giant black hole or something?

OccultHawk · 02-09-2019, 04:10 PM

Quote:

Nothing then can escape this black holes event horizon

Yes not even light. Something that’s repeated on every space documentary ever made.

However, if the rate of acceleration were greater than the gravitational pull of the black hole that object would indeed escape. . But nothing moves faster than light so that’s the ultimate in acceleration...unless we’re talking about the expansion of the universe.

I think your question is why was the matter allowed to escape if nothing can escape something that dense.

I think there’s two parts to answering that. 1) The language being used to describe the phenomenon is confusing. Black holes don’t have infinite gravitational pull or density. It’s just approaching infinite. And nothing doesn’t really mean nothing it just means nothing that we know of. 2) The rate of expansion of the universe isn’t beholden to the laws of physics because it’s not happening in space. It’s not happening inside the universe; it’s happening to the universe.

I also think part of your question hinges on what was happening or what existed before the Big Bang. That’s either an unknown or as absurd of a question as asking someone what they were doing before they were conceived (sittin in my daddy’s nutsac bitch). But energy comes from matter and has no mass. They often say the entire universe was smaller than a single atom. But I think what escaped during the Big Bang was energy and not matter. I don’t think it’s possible that the energy was in the form of photons because of the wave particle duality.

Sorry for all the “I thinks” but I need the qualifier

I ain’t saying “I know”

**Marie Monday** · 02-09-2019, 04:26 PM

Quote:

Originally Posted by OccultHawk

I think there’s two parts to answering that. 1) The language being used to describe the phenomenon is confusing. Black holes don’t have infinite gravitational pull or density. It’s just approaching infinite. And nothing doesn’t really mean nothing it just means nothing that we know of. 2) The rate of expansion of the universe isn’t beholden to the laws of physics because it’s not happening in space. It’s not happening inside the universe; it’s happening to the universe.

This is interesting. On the first point: but all matter that we do know of could not have escaped a black hole. You can also think of a black hole as a spacetime that's bent in such a way that no possible trajectories in spacetime lead out, which seems even more forbidding. On your second point: I think that might actually be the answer to all this, it's a clever way of thinking about it

OccultHawk · 02-09-2019, 04:43 PM

Have you ever read about electrons and quantum tunneling?

**Marie Monday** · 02-09-2019, 04:51 PM

Yep, I study physics so I read lots about it at some point, it's been a while though

OccultHawk · 02-09-2019, 05:16 PM

Quote:

Originally Posted by MariaExpressesHerself

Yep, I study physics so I read lots about it at some point, it's been a while though

You think those sneaky bastards can tunnel their asses out of a black hole’s event horizon?

**Marie Monday** · 02-10-2019, 07:35 AM

That might certainly be possible. I haven't heard anything about it, and maybe our inability to combine general relativity and quantum physics entirely gets in the way, but of course there is Hawking radiation which is a quantum effect by which matter escapes black holes. The constraints in relativity (like not getting out past event horizons) are generally based on causality. Quantum mechanics has several processes which seem to violate relativity, but actually don't because causality is not an issue: entanglement, Hawking radiation and maybe tunneling too.

Edit: read up on it, and apparently tunneling might be a source of Hawking radiation:
https://en.wikipedia.org/wiki/Hawking_radiation
(they mention tunneling here at some point)
found this too:
http://www.physics.umd.edu/grt/taj/776b/fleming.pdf

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