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Reply | Time
at 16:56 29 Jul 2014
I think the fact that time flows shows it exists, without time nothing would change from moment to moment. |
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Reply | Why do we assume...
at 20:24 22 Jul 2014
I was only saying that the theories we can't test are educated guesses, like what happens near a Black Hole. General Relativity can and has been tested. |
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Reply | Why do we assume...
at 02:58 22 Jul 2014
I agree, we can only come up with ideas based on educated guesses when it comes to these sort of things unfortunately, the best thing for everyone to do is keep an open mind. Even Stephen Hawking has recently gone back on his previous theory about Black Holes having Event Horizons, and most people who accepted his original theory are unwilling to change their minds. |
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Reply | Time
at 00:35 22 Jul 2014
Quantum mechanics is just crazy, hopefully at some point we'll actually start understanding it, because we still don't really have a clue, and we've known about it for over a century now |
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Reply | Why do we assume...
at 00:26 22 Jul 2014
Black Holes are leftovers from Stars that have used up all their fuel, so to speak, because stars are essentially a battle between the gravity pulling them in to the centre, and the radiation created from the fusion processes being thrown outwards, they stay stable like that until all the hydrogen is used up, it then tries to fuse heavier elements together until it gets to the elements where no energy is released from fusing the atoms together such as Iron. When this happens, the star collapses under it's own gravity and all the matter is compressed into a very small area at the centre, and this becomes so dense that nothing can escape it's pull, not even light, and that is why it appears black. As for where stuff goes when it goes in, no one can answer that with any certainty, but when things go into it this increases the mass of the black hole and this is why they grow, eventually all the big stars will become black holes, suck in all the matter in the universe, until there is nothing left, and then they will decay, as they release Hawking radiation (This is a complex process to do with virtual particles, if you want to read more into it), until the universe is a cold dark place. But there are several different possible outcomes for the universe that depend on certain constants. |
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Reply | Why do we assume...
at 21:14 20 Jul 2014
Well "up" is a thing humans have come up with as the opposite of "towards the Earth" or down. In space there is no up or down really. |
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Reply | Time
at 15:47 20 Jul 2014
Well I don't mean anytime soon, in a few centuries, harnessing the power of black holes, it's believed to be possible to create a wormhole which going through would take you to a different co-ordinate in space and a past point in time. But that'll happen well into our future, we're no where near capable of doing it at the moment, but then just a couple of centuries ago people thought our Solar system was all that existed. |
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Reply | Time
at 15:20 20 Jul 2014
Time is another dimension, in the sense that we can move in any of the three spatial directions, we can also move forward in time (maybe in future even backwards), there are many theories that time does not exist, I think there's a through the wormhole episode all about this, and I seem to remember them discussing two dimensions of time which seemed a little farfetched but who knows. Time is also a personal thing, as we get older we perceive time to be running faster than it used to when we were younger, and I saw somewhere that one man was driving along one day when the whole world just sped up and time seemed to be going incredibly fast, but what really happened is that he had a neurological problem which made his brain process information much slower and his body had just slowed down which gave the same effect. All I know is that treating time and space as one and the same is fundamental to general relativity and that theory is still standing. |
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Reply | Why do we assume...
at 13:43 20 Jul 2014
No problem, watch out for the one where they discuss the universe being a hologram, that one made my head hurt haha |
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Reply | Why do we assume...
at 03:12 20 Jul 2014
Has anyone watched any of the Through The Wormhole With Morgan Freeman TV series? Nothing has ever blown my mind as much as that series, and I'm only on season 2. Some of it I'm very wary of as if they've deliberately gone out to find the wackiest theories to make good TV, but some of it is incredible, I'd recommend it to anyone with even the slightest interest in science in general |
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Reply | Why do we assume...
at 02:43 20 Jul 2014
The Higgs Boson has been discovered in the last two years, and more and more evidence supporting the theory of it is being found, and I don't think that is the problem with gravity, the problem we have is that Quantum Mechanics and General Relativity have constantly agreed with our predictions and are solid theories, but they're incompatible with one another and a lot of scientists are trying to find a way to connect them together, I believe (Not certain) that this is partly or maybe wholely what string theory is about, and possibly (and it would make sense I suppose) Quantum Gravity. The problem is general relativity requires smooth continuous space-time, while Quantum Mechanics is ruled by uncertainty and probabilities.
Saying this, I too mostly learnt all this from documentaries and articles on the internet, and to be honest I think I've learnt more concepts from them than from my Theoretical Physics degree I'm about to finish the master's level in at the University, makes you wonder doesn't it haha |
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Reply | Why do we assume...
at 23:39 19 Jul 2014
Technically Space and time are one and the same thing, Spacetime, and time does not flow at the same rate everywhere. With regards to the original post, there are just some questions we will never be able to answer, and we have to accept that, but there are so many fascinating phenomena that occur that most people are ignorant of, especially in Quantum mechanics, and just finding out as much as possible is enough for me
This is the first time I've seen anything Physics related posted on here so I jumped on the opportunity to become active haha |
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