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Originally posted by Sushipunk [quote]What if there was a black hole (or something similar) that was so large and so dense that it slowed the expansion, and eventually reversed it? Is something like that possible?

All the matter in the entire universe is not strong enough to slow down or reverse this expansion.

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That's why the 'cyclical' theory makes more sense (to me anyway )

Well, how can the cyclical theory be true if the universe's expansion isn't slowing down or reversing, but growing faster and faster?

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Originally posted by Sunsnail 1) The universe doesn't have to have a beginning

Big Bang Theory

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Originally posted by Sushipunk That doesn't make sense. The gravity from a black hole is so great that even light can't escape from it. That isn't the case with a planet's gravity.

http://cosmology.berkeley.edu/Education/BHfaq.html#q6

(link is weird, look for "if the sun became a black hole")

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Originally posted by Krypton Big Bang Theory

not necessarily a beginning

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Originally posted by Krypton All the matter in the entire universe is not strong enough to slow down or reverse this expansion.

If you say so. I really wouldn't know

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Originally posted by Krypton Well, how can the cyclical theory be true if the universe's expansion isn't slowing down or reversing, but growing faster and faster?

So the expansion is accelerating? What is causing that?

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Originally posted by Sushipunk So the expansion is accelerating? What is causing that?

yes.

http://en.wikipedia.org/wiki/Metric_expansion_of_space

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Originally posted by Sushipunk What is causing that?

well that's the question isn't it? this is where dark energy or matter enters the discussion. the only answer to your question right now is we simply don't know.

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Originally posted by Sushipunk If you say so. I really wouldn't know

Well, it's simple. The universe is expanding despite the huge amount of matter in it. So you can say that all the matter in the universe is not making the expansion slow down or reverse.

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So the expansion is accelerating? What is causing that?

The expansion is due partly to inertia (that is, the matter in the universe is separating because it was separating in the past) and partly to a repulsive force of unknown nature, which may be a cosmological constant. Inertia dominated the expansion in the early universe, and according to the ΛCDM model the cosmological constant will dominate in the future. In the present era they contribute in roughly equal proportions.

http://en.wikipedia.org/wiki/Metric_expansion_of_space
http://en.wikipedia.org/wiki/Hubble's_Law

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Originally posted by pkcRAISTLIN well that's the question isn't it? this is where dark energy or matter enters the discussion. the only answer to your question right now is we simply don't know.

That means there's a possibility that I'm right!

No idea what I might be right about though. All this stuff is such a huge head-fuck. I haven't thought about it much since I stopped smoking weed

Just think of a grenade. The particles of a grenade after the boom are traveling very very fast, eventually slowing down to resistance of the air and gravity. This is only a very few second, and this is relatively a very small bang in comparison to that needed to spark the universe.
Like I said earlier padwan, the universe may not
1) have yet reached a point where it has succumbed to its internal resistance. So we could very well have billions of more years to go before there an observation can be made that the universe has ceased its accelerated growth.
2) the bang was just so enormous that the outer most particles are traveling too fast to be affected by the gravity of particles of a different time/space.

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Originally posted by Sushipunk All this stuff is such a huge head-fuck.

that's what we love

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Originally posted by SuspicionVandit Just think of a grenade. The particles of a grenade after the boom are traveling very very fast, eventually slowing down to resistance of the air and gravity. This is only a very few second, and this is relatively a very small bang in comparison to that needed to spark the universe. Like I said earlier padwan, the universe may not 1) have yet reached a point where it has succumbed to its internal resistance. So we could very well have billions of more years to go before there an observation can be made that the universe has ceased its accelerated growth. 2) the bang was just so enormous that the outer most particles are traveling too fast to be affected by the gravity of particles of a different time/space.

There is a problem with that. First, the grenade's blast is expanding into air, which provides friction. There is no friction in outer space. The universe is not expanding into air. So there is nothing that is going to slow down its expansion.

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Originally posted by SuspicionVandit Just think of a grenade. The particles of a grenade after the boom are traveling very very fast, eventually slowing down to resistance of the air and gravity. This is only a very few second, and this is relatively a very small bang in comparison to that needed to spark the universe. Like I said earlier padwan, the universe may not 1) have yet reached a point where it has succumbed to its internal resistance. So we could very well have billions of more years to go before there an observation can be made that the universe has ceased its accelerated growth. 2) the bang was just so enormous that the outer most particles are traveling too fast to be affected by the gravity of particles of a different time/space.

the only issue i have with this is that the grenade's fragments are slowing down from the instant they explode, right? at no time do they accelerate after the initial bang. unless im mistaken, which is more than likely.

There's no air friction in space. There is friction. Very little, though.

yeah but explain the molten steel


yeah i'm exit. i feel bad when I'm wrong. bad jimmy bad jimmy smith jr

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Originally posted by SuspicionVandit yeah but explain the molten steel

Re: A Baffling Physics Question That Should Make You Think

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Originally posted by Krypton The law of conservation of mass and energy states that matter cannot be created or destroyed in a system, only transferred. So, how did matter and energy get here in the first place? Is it infinite? Well, if it's infinite, and the universe had a beginning at the Big Bang, then WTF?

this topic is a constant interest for thousands of physicists (like my dad) around the world. and you want someone on TA to give you THE answer straight out of their pocket? massive fail

lawl, boris we don't expect that- we just like to debate and share ideas!







































































































plur

big bang theory is clearly a lie devised by the liberal media

let's bring this discussion back to god, this time with six wings.

Oooooh where do I start in this thread

With the original post I guess....

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Originally posted by Krypton The law of conservation of mass and energy states that matter cannot be created or destroyed in a system, only transferred. So, how did matter and energy get here in the first place? Is it infinite? Well, if it's infinite, and the universe had a beginning at the Big Bang, then WTF?

....not by critising it, but adding to it to induce further confusion in the COR...

Particles can actually appear out of nowhere, they can just spontaneously be "created" in our universe having borrowed energy from essentially nowhere! They don't stick around much and have an incredibly small lifespan, but still, food for thought

As for the "big crunch", we don't know if that's going to happen yet as we haven't summed up all the forces involved to make a conclusion. There is obviously gravity which is wanting to pull the universe back together, but if you didn't know there is a force that is actually increasing the rate of expansion of our universe. Interesting stuff.

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Originally posted by Acton Particles can actually appear out of nowhere, they can just spontaneously be "created" in our universe having borrowed energy from essentially nowhere! They don't stick around much and have an incredibly small lifespan, but still, food for thought

I've read about that before, but it's so fucking vague. And, there are lots of issues with what could only be described as 'measurement error'.

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Originally posted by Sushipunk I've read about that before, but it's so fucking vague. And, there are lots of issues with what could only be described as 'measurement error'.

What I mentioned in my post is explained by the Uncertainty Principle, which essentially, is all to do with measurement .

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Originally posted by Acton What I mentioned in my post is explained by the Uncertainty Principle, which essentially, is all to do with measurement .

It's definitely interesting shit, I'll give you that.

My biggest issue with all of this is mostly the measurement factor though. I mean, we THINK we're measuring it all correctly, but are we even getting close?

It's also why I think this is such a popular topic of disussion. People can throw in any and all kinds of theories without any risk of being proven wrong

Re: Re: Re: A Baffling Physics Question That Should Make You Think

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Originally posted by Krypton If the universe has a beginning, how could matter and energy have been here all along?

Why should the universe have a beginning? And what makes you think the big bang must've been the very initial starting point of the universe?

As a matter of fact, why do you believe the universe we know is all there is? There could be many more multiverses!

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Originally posted by jennypie Oh great, another religion thread.

This made me laugh for some reason.

Re: Re: A Baffling Physics Question That Should Make You Think

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Originally posted by boris_the_bear this topic is a constant interest for thousands of physicists (like my dad) around the world. and you want someone on TA to give you THE answer straight out of their pocket? massive fail

I wanted to start an interesting discussion. Sorry if that bothers you..

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