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How the fuck could he define that? The world's best scientist can only approach this subject from a theoretical standpoint, nobody knows what's actually 'there' (at the heart of a black hole for example)
The Most Distant Object Discovered in the Universe - Page 2
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minus_human
4784 Posts
How the fuck could he define that? The world's best scientist can only approach this subject from a theoretical standpoint, nobody knows what's actually 'there' (at the heart of a black hole for example) | ||
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ilj.psa
Peru3081 Posts
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Navane
Netherlands2749 Posts
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MiniRoman
Canada3953 Posts
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InsanitY
Germany352 Posts
i would recommend you reading "the elegant universe" by brian greene. i didnt finish it yet but i've read like 3/4 and thought it was a great book up to now. there's also a second book by him which i havent read yet. the english title is "The Fabric of the Cosmos" i think | ||
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SixSongs
Poland1455 Posts
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Tyrant
Korea (South)234 Posts
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Makhno
Sweden585 Posts
On May 06 2009 19:22 Thats_The_Spirit wrote: I've read "stars and falling apples" by ulf danielsson. I think it was really good and easy accessible by people without a background in physics. It covers the different theories (including relativity, and string) and other things about the universe and explains them with good and understandable examples. Also i liked "a brief history of time", by stephen hawking That's a great book and his latest, "The best of all possible worlds" is also very good. He is actually based in my university which is very cool and I see him all the time but I dare not ask him the great questions about the universe. | ||
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Luddite
United States2315 Posts
During the first couple of million years the universe had to be expanding at a rate tremendously faster than the speed of light. If this wasn’t the case then the light of the explosion would have passed our location in the universe a couple of billion years ago (because of the limited side of the universe at an age of 600 million years) and we never would have been able to see it. After a while the expansion rate had to slow down, or the light wouldn’t be able to catch up to us, and we again wouldn’t be able to see it. Not for a couple of million years, but, most of the more recent models of the early universe do include a brief period called the inflationary period where the universe was expanding much more rapidly than the speed of light. to quote hyperphysics: "Triggered by the symmetry breaking that separates off the strong force, models suggest an extraordinary inflationary phase in the era 10^-36 seconds to 10^-32 seconds. More expansion is presumed to have occurred in this instant than in the entire period ( 14 billion years?) since." | ||
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InToTheWannaB
United States4770 Posts
Not that i know wtf i am talking about, but from what I've learn I thought that the universe was not really expanding faster then light. It was just that at the time of the big bang. When gravity, the strong/weak nuclear, and electromagnetism were combined. The laws of faster then light travel were not in place yet. So matter expanded like super quick in that small amount of time just before those 4 forces broke away from each other. I don't know its all confusing but that's what I always understood. | ||
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Xenixx
United States499 Posts
That map was hirarious. | ||
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sith
United States2474 Posts
On May 07 2009 03:20 Makhno wrote: That's a great book and his latest, "The best of all possible worlds" is also very good. He is actually based in my university which is very cool and I see him all the time but I dare not ask him the great questions about the universe. Both of his books that I've read were quite good and explained the concepts to anyone with even very limited knowledge of physics. These are the two that I have read, I didn't know he had a third and I'll definitely have to pick that up. Brian Greene - The Fabric of the Cosmos Brian Greene - The Elegant Universe Edit: I couldn't find a book named "The best of all possible worlds" by Brian Greene, are you sure he wrote it? This is the closest I found: Ivar Ekeland - The Best of All Possible Worlds | ||
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Luddite
United States2315 Posts
On May 07 2009 04:23 InToTheWannaB wrote: Not that i know wtf i am talking about, but from what I've learn I thought that the universe was not really expanding faster then light. It was just that at the time of the big bang. When gravity, the strong/weak nuclear, and electromagnetism were combined. The laws of faster then light travel were not in place yet. So matter expanded like super quick in that small amount of time just before those 4 forces broke away from each other. I don't know its all confusing but that's what I always understood. No, the period where the forces were unified came first, and lasted for only like 10^-43 seconds. It's a period we basically know nothing about, though. The inflationary phase of faster-than-light expansion came afterwards. Of course inflation has only recently started to gain wide acceptance, and it's still very much under debate, so no one can give a firm answer for exactly how and why it happened. | ||
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Luddite
United States2315 Posts
On May 07 2009 04:55 Xenixx wrote: That sounds like quantum mechanics... but I could've sworn I read something about traveling faster than light... nearing the speed of light things turn purplish. Reading a few articles on light speed I know theres nothing that exceeds it (that we know about I'm sure theres something) but I have this personal theory that somewhere out there physics/math doesn't hold up. Usually when you talk about things going faster than light speed, what it means is that the light wasn't in a vacuum (light goes slower through matter than it does through a vacuum). But if you really want to "break the speed of light", in other words to have something faster than light, in a vacuum, in the same reference frame, you'd pretty much need to prove that the theory of relativity is wrong, because the theory is quite clear about that (as speed goes to C, energy increases to infinitiy, so you'd need an infinite amount of energy to get to light speed. Interestingly the mathematics DO allow for something which is already traveling faster than light speed, and which could never slow down below C. But that wouldn't really make much sense). Anyway I wouldn't bank on relativity being wrong since it's been tested countless times and it's ALWAYS help up perfectly. | ||
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InToTheWannaB
United States4770 Posts
http://www.youtube.com/view_play_list?p=8AB46D948616D856&search_query=The Universe - Beyond The Big Bang | ||
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Xusneb
Canada612 Posts
Then I usually go have a good lunch and I forget about this existential quandary. | ||
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Thats_The_Spirit
Netherlands138 Posts
On May 07 2009 05:19 sith wrote: Both of his books that I've read were quite good and explained the concepts to anyone with even very limited knowledge of physics. These are the two that I have read, I didn't know he had a third and I'll definitely have to pick that up. Brian Greene - The Fabric of the Cosmos Brian Greene - The Elegant Universe Edit: I couldn't find a book named "The best of all possible worlds" by Brian Greene, are you sure he wrote it? This is the closest I found: Ivar Ekeland - The Best of All Possible Worlds Makhno is referring to "the best of all possible worlds" by ulf danielsson, not brian greene. I've found that the english version is also called "the best of worlds" And Makhno, that is really cool that hes at your university. Did you ever attended any of his lectures? I'll see if i can find his newest book you talked about, the reviews i've found show that it's an interesting read. | ||
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CharlieMurphy
United States22895 Posts
woah that is a fucking sick theory. PS- The universe expands really fast because its like a balloon that doesn't pop. I'm sure you've all seen the experiment. Take a slightly inflated balloon and place a few dots on it and random places. Fill it up with air and watch as the dots spread apart. Now imagine that balloon expanding bigger and bigger. From the center standpoint it seems like the dots are traveling at huge speeds away from you but in reality they are all just riding the plane together. It is the SPACE itself which is expanding/spreading not the actual objects moving. Just like how a buoyant object moves up when the water rises. | ||
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Maenander
Germany4926 Posts
Time seems finite, while we cannot be sure about space. There can be galaxies which are so far away, that their light can never reach us due to the expansion of the universe. Space itself expands, and "recession velocities" greater than the speed of light do not violate general relativity at all, since there is no real movement, just the space between to objects expanding. That´s why it is a mistake to use the relativistic Doppler formula for cosmological redshifts. edit: time seems finite as in there seems to be a beginning; that´s maybe more astonishing than infinities edit: oops some mistakes, I shouldn´t type my thoughts in a hurry | ||
FakeSteve[TPR]
Valhalla18444 Posts
On May 07 2009 16:14 CharlieMurphy wrote: woah that is a fucking sick theory. PS- The universe expands really fast because its like a balloon that doesn't pop. I'm sure you've all seen the experiment. Take a slightly inflated balloon and place a few dots on it and random places. Fill it up with air and watch as the dots spread apart. Now imagine that balloon expanding bigger and bigger. From the center standpoint it seems like the dots are traveling at huge speeds away from you but in reality they are all just riding the plane together. It is the SPACE itself which is expanding/spreading not the actual objects moving. Just like how a buoyant object moves up when the water rises. according to that guy (very basically) our universe began with a star in an already-existent universe exploding and creating a black hole pretty neat | ||
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