Christopher Hitchens Tribute

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-4 1. banzemanga commented 12 years ago

Is it just me or there is a fail in some logic? If the universe is expanding it does not becomes nothing, it just that the distance among them becomes father apart.
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+4 2. xmadxxx commented 12 years ago

i will be dead then xD
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+4 3. thomiek commented 12 years ago

#1 It becomes nothing in a sense that we can't observe it. Whole idea of something versus nothing is one being able to observe this something. That's why it's called Observable Universe as the Big Bang theory states.
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+2 4. banzemanga commented 12 years ago

#3 Thanks for the clarification. My fault for not listening carefully. He did say "nothing observable". But that begs the question, how can we be sure nothing would be observable? The only way for us not to be able to observe anything is by either all the lights emitted by other galaxies are put out or something blocks the incoming lights.

I mean, if the universe is expanding and the distance is getting longer. It means that it will take longer distance for lights to travel; whatever millions of light-years extra it is.
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-7 5. mashkalji commented 12 years ago

so the universe is expanding huh!

interesting reading:

http://www.speed-light.info/expanding_universe.htm
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0 6. gouranga4ever commented 12 years ago

#4 Correct and it will get to a point when the expansion *between* galaxies will be faster than the speed of light. This doesn't contradict Relativity as it's two things moving apart from a single reference point.
But the point is that astronomers will look up and only see our Galaxy. They'll discover relativity and quantum physics and everything else but they'll come to the wrong conclusion because their Universe will seem to consist of a single Galaxy floating in space.
There's an excellent YouTube Video (too long for Snotr) by Laurence Krauss "A Universe from Nothing" on this subject.
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+2 7. cosminb commented 12 years ago

#4 Having less light coming from a particular source makes it harder to detect/observe. If the distance is too great, it becomes almost impossible to detect it properly. I believe there is a limit to what our devices are able to 'see' from space...
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+5 8. loadrunner commented 12 years ago

#6 we cannot see some objects jet, because the light had no time to reach us, since the existence of the universe. The sky is the limit. we only use our "eyes" to see space. But we almost forget we haven't seen everything on our own planet yet.
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+3 9. Oddi commented 12 years ago

#4 the real problem apart from our devices detection limit should be when something goes away from us at, or maybe faster than speed of light.. so the light coming from there will never reach us at all. By 'normal' means anyway. ;)
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+5 10. spynode commented 12 years ago

#3 Actually that is not what The Big Bang theory states. It is about creation of the universe not observable parts of it. Mr. Hitchens talks about origins of Big Bang, and then compares the theoretical nothing before it with the result of expansion of this universe. #1 is right, there is some lack of logic. Universe could turn into nothing maybe because of all of the energy being vaporized with a help of huge black hole. There are several scenarios. But universe is not going to disappear because of expansion. What we can or cannot observe has nothing to do with whether or not something exists. And people voting down 1st comment really have no clue about what he is talking about.
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+1 11. Denaro commented 12 years ago

Good video, i like the progression of thought! I wish I had this cohesiveness of thought when trying to argue with people about these topics!
Anyway - the idea of the universe collapsing and disappearing. No scientific model nor theory that is widely accepted lends to the idea that the universe will disappear, due to the evidence provided by Edwin Hubble in regards to the red-shift we see when observing distant galaxies (which are moving away from us faster than those that reside closer to us). Rather than saying the universe is 'extending' itself, it's more appropriate to say the distance between two points within the universe is increasing, like the two points on the surface of a balloon that is being inflated. Another point, the traces of the big bang have already been detected, and is known as the Cosmic Background Radiation, and is the faint microwave background left over after the big bang. But the big bang shouldn't be taken literally. General Relativity jsut predicts there to be a point in time at which temperature, density and curvature of the universe to be infinite aka a singularity aka the big bang.
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+3 12. nomaddaf commented 12 years ago

You are all missing the point.He is not saying the universe will stop existing. His point is that we once believed we were the center of a vast universe, But one day when we are out of sight of all star light and radio waves we will believe that we are in fact the entire universe. The night sky will be black. Our radio telescopes will here nothing. Tales of stars will fade into myth. Unless we find that it all somehow rolls back in on itself and all matter is all recycled to start a new, every rock that is will be an island unto its self.But that is one of the least of his points, and sad if that is all you took away from this talk.
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0 13. cyberdevil commented 12 years ago

A lot of interesting things are said in this video, and along with that there's a lot of amazing footage. Good watch.