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Old 24-05-2004, 17:17:28   #1
Darkstar
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How big is the universe?

The answer is: 156 Billion Light Years Wide! (or bigger)

Article that mentions this:
http://www.space.com/scienceastronom...ay_040524.html

Latest and greatest things figured out about the cosmos. For the few of you into it, enjoy.
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Old 24-05-2004, 17:18:25   #2
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Is that big enough for Venom?
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Old 24-05-2004, 17:19:21   #3
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Apparently.
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Old 24-05-2004, 17:20:23   #4
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That "or bigger" does tend to reduce my awe at the answer.
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Old 24-05-2004, 17:24:14   #5
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You skeptic!

They'll refine the answer over the coming years. Besides, it's not like we got the value of pie accurate for, oh... about 4,000 years. As long as you discount the East.
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Old 25-05-2004, 01:41:01   #6
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Hmmm...

Puts it into the category of 'lies, bloody lies, and statistics' to my mind.

I very much prefer the 'speed of light is a variable' school.

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Old 25-05-2004, 01:44:09   #7
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Quote:
Originally posted by Darkstar
Besides, it's not like we got the value of pie accurate for, oh... about 4,000 years.
Yes we have done quite a lot to perfect the art of baking over time.
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Old 25-05-2004, 01:50:51   #8
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If you take the diameter of an Apple, so let's say 2 meters, and multiply it by e, then by pi, square it, and then multiply it by infinity-minus-one, you got yourself the answer.
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Old 25-05-2004, 01:56:10   #9
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Old 25-05-2004, 06:15:22   #10
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"All the distance covered by the light in the early universe gets increased by the expansion of the universe,"

Hmm... so by the "stretching" of space, light travels faster than the speed of light?

Wonder what our physics crowd thinks of this...
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Old 25-05-2004, 07:43:02   #11
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The expression "at least" probably says the same thing without drawing so much attention to it's lack of precision.

So does this, or does it not, remove the claim that it is infinitely largre then ? I was happy with a finite universe, but over the last few years the popular science mags seem to have started suggesting infinity once more, which I wasn't so keen to accept.
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Old 25-05-2004, 07:45:14   #12
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I think the physics crowd wouldn't be too fussed. I've not read the article yet but is the idea not that light in a vacuum is sped up, but that it has travelled further because space expanded behind it ?
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Old 25-05-2004, 08:23:44   #13
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Well, I'm not to fussed about it.
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Old 25-05-2004, 12:35:12   #14
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I think that's what they're saying. It's like being on an airplane and walking towards the front of the plane. To the observers on the plane, your speed is like 2 miles an hour, but in actuality you're going 502 miles an hour instead of 500.
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Old 25-05-2004, 12:37:51   #15
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So what would happen if you were standing on a plane traveling @ light speed, and you walked towards the front of the plane?
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Old 25-05-2004, 12:39:34   #16
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Your pants would fall off. But since light doesn't wear any pants, it's not in danger.
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Old 25-05-2004, 12:40:58   #17
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The universe is big.
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Old 25-05-2004, 12:41:22   #18
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If you ran quickly to the front of the plane and turned round, would you see you running towards you in a Bionic man stylie.
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Old 25-05-2004, 12:42:33   #19
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You wouldn't see anything behind you because you ran away from all the light.
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Old 25-05-2004, 12:43:21   #20
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Quote:
Originally posted by shagnasty
So what would happen if you were standing on a plane traveling @ light speed, and you walked towards the front of the plane?
Inside the plane you don't know that you are travelling at light speed so you just walk forwards normally.

Someone outside the plane who sees the plane travelling at light speed would see no time passing within the plane so they couldn't tell that you were moving forwards.
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Old 25-05-2004, 12:44:15   #21
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Wouldn't that be cool though.
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Old 25-05-2004, 12:46:28   #22
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We really need to figure out how to travel light speed because that would be cool.
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Old 25-05-2004, 13:04:13   #23
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I wish this day would go at light speed. Well as near as damn it anyway.
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Old 25-05-2004, 13:09:32   #24
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If you were going at lightspeed the day would last forever.
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Old 25-05-2004, 13:11:06   #25
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Well then I wish it and everything in it would bloody stop so I could bugger off and get some kip.
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Old 25-05-2004, 13:13:12   #26
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But when you stop time, everything stops as well?
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Old 25-05-2004, 13:14:59   #27
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Thats fine. As long as I can sod off for a little while.
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Old 25-05-2004, 13:16:02   #28
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I don't see why they don't like the idea that the universe is infinately big, but are prepared to assume it sprang from an infinately dense point. All observations we make of the universes dimensions are completely subject to our perspective of it anyway.

I won't believe the universe is finite untill someone can proove that an Edge exists once and for all!
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Old 25-05-2004, 13:16:30   #29
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Quote:
Originally posted by chagarra


I very much prefer the 'speed of light is a variable' school.

[nitpick]
Good thing you're so open minded and not saying it's a constant .
[/nitpick]
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Old 25-05-2004, 13:17:32   #30
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Don't ruin it all by going all sciencey you lot.
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Old 25-05-2004, 13:17:46   #31
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Quote:
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But when you stop time, everything stops as well?
To shagnasty it'd seem as if the day went at normal speed. Someone watching him zoom off at light speed would see him stationary forever.

Imagine there's a clock in front of you.

It zooms away at light speed.

The light from the clock travels towards you at the speed of light as the clock speeds away at the same speed. So you see the same image of the clock forever.
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Old 25-05-2004, 13:19:08   #32
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A clock going the speed of light. That's hilarious!
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Old 25-05-2004, 13:19:48   #33
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Even a digital clock?
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Old 25-05-2004, 13:19:54   #34
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I love shit like this, it's the best thing about physics. I got a first on my Relativity course at uni.
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Old 25-05-2004, 13:21:25   #35
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It is pretty cool. And it's fun to confuse people with.
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Old 25-05-2004, 13:22:06   #36
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Quote:
Originally posted by protein
Even a digital clock?
Own goal?

Yes. We can't make stuff go at light speed but if it's going fast enough, or your sensors are accurate enough you can test it.

They had 2 synchronised atomic clocks, sent one clock up in a plane, and had it circle the earth a few times, when it returned it was a few fractions of a second slow.
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Old 25-05-2004, 13:23:06   #37
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I want to live on an airplane so I'll live longer than the fools below me.
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Old 25-05-2004, 13:23:26   #38
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Originally posted by Funkodrom
I love shit like this, it's the best thing about physics. I got a first on my Relativity course at uni.
I'm sure given time and a knowledge of relativity theory I could come up with a great joke here.

hmm.
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Old 25-05-2004, 13:23:52   #39
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So if something with mass were somehow travelling the speed of light and it smashed into something would it be like bigger than a nuclear explosion?
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Old 25-05-2004, 13:25:32   #40
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Something with rest mass. Photons have mass and travel at light speed and smash into stuff all the time.

Getting something with rest mass to light speed would mean it had infinite energy. It'd be bigger than the big bang!
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Old 25-05-2004, 13:27:02   #41
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I should imagine that would do something pretty close to BANG.
Are you plotting Venom?
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Old 25-05-2004, 13:27:40   #42
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So if you were on a plane travelling at the speed of light looking at a clock and bouncing a rubber ball against the cockpit door would you be some sort of super-rich timelord?
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Old 25-05-2004, 13:28:54   #43
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Yars.
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Old 25-05-2004, 13:29:58   #44
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Quote:
Originally posted by Funkodrom
Something with rest mass. Photons have mass and travel at light speed and smash into stuff all the time.

Getting something with rest mass to light speed would mean it had infinite energy. It'd be bigger than the big bang!
That's what I thought. That would be awesome. And would also probably mean FTL isn't possible because a little galactic fender bender and BOOM there goes the universe.
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Old 25-05-2004, 13:31:57   #45
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That's why the secret of FTL is not to move fast but bend space time so that you can go somewhere 'far away' by travelling only a short distance.
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Old 25-05-2004, 13:32:44   #46
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Quote:
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So if you were on a plane travelling at the speed of light looking at a clock and bouncing a rubber ball against the cockpit door would you be some sort of super-rich timelord?
With Billie as your assistant.

http://news.bbc.co.uk/1/hi/in_pictures/3744067.stm
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Old 25-05-2004, 13:32:59   #47
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Quote:
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Getting something with rest mass to light speed would mean it had infinite energy. It'd be bigger than the big bang!
Ek= (mv^2)*1/2

v=c

m is finite

Infinite ?
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Old 25-05-2004, 13:33:56   #48
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We've got reports of an accident on Galactic Highway 40. You should be feeling the shockwave momentarily...or in 10,000 years, depending on where you live.
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Old 25-05-2004, 13:35:02   #49
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Quote:
Originally posted by LoD
Ek= (mv^2)*1/2

v=c

m is finite

Infinite ?
I don't know what any of that means, but are you saying that mass doesn't get infinite as you approach, and reach, c?
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Old 25-05-2004, 13:35:30   #50
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With Billie as your assistant.

http://news.bbc.co.uk/1/hi/in_pictures/3744067.stm
I heard about that this morning. Not sure what I think yet. I suppose it's all in the writing.
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