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  #1 (permalink)  
Old 22-May-2007, 06:52 PM
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Fraser Fraser is offline
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Default Our Lonely Future, 3 Trillion Years From Now

When astronomers look into the night sky, they see back into time. The light from the most distant galaxies has taken billions of years to reach us. Astronomers can measure that these galaxies are hurtling away from us, as part of the Universe's expansion after the Big Bang. ...

Read the full blog entry
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Old 22-May-2007, 08:02 PM
SN1987A SN1987A is offline
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Nothing to worry; we would have collided with the Andromeda much sooner than that!
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Old 22-May-2007, 10:02 PM
Triclyde Triclyde is offline
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Speaking of colliding with Andromeda, I thought that galaxies were incredibly small compared to the space between them. Doesn't that make our impending collision with Andromeda a fluke of epic proportions? Or are galactic collisions more commonplace than I think?
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Old 22-May-2007, 10:17 PM
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Originally Posted by Triclyde View Post
Or are galactic collisions more commonplace than I think?
Does your thinking include the fact that many current galaxies appear to be the result of galactic collisions?

Space.com: Galactic Collisions Fast and Frequent

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There's room in the universe for thousands of galaxies but that doesn't stop them from running into each other. New observations support the idea that galaxies are in constant interaction with each other and that the biggest ones get bigger by engulfing smaller ones.

These observations confirm a long-standing theory about how the universe works in general and sheds light on how things got started in the first place.

"This is the way that everything in the universe was formed," said Pieter van Dokkum of Yale University. "It's a never-ending story of things colliding--small things colliding to make big things, big things colliding to make bigger things. These are the events that shape today's galaxies."
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Old 22-May-2007, 11:12 PM
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Noclevername Noclevername is offline
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Quote:
Originally Posted by Triclyde View Post
Speaking of colliding with Andromeda, I thought that galaxies were incredibly small compared to the space between them. Doesn't that make our impending collision with Andromeda a fluke of epic proportions? Or are galactic collisions more commonplace than I think?

Galaxies tend to gather in clusters. Andromeda is part of the same cluster we're in. And they don't move in straight lines, they swirl and orbit and slingshot around each other.
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Old 23-May-2007, 12:52 AM
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Alway been curious as to if the Milky Way's two satellite galaxies (The Magellenic Clouds) might be the results of a near miss ripping or pulling those clusters into our orbit.
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Old 23-May-2007, 05:27 AM
belcan belcan is offline
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In billions of years, distant galaxies will be speeding away from the Milky Way so quickly that they will recede from us faster than the speed of light.

This is quote from the article. Now I'm confused. Is it really possible to have a speed faster than light?
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Old 23-May-2007, 05:56 AM
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In billions of years, distant galaxies will be speeding away from the Milky Way so quickly that they will recede from us faster than the speed of light.

This is quote from the article. Now I'm confused. Is it really possible to have a speed faster than light?
Sure, if you play loosely with words.

Preposterous Universe: Cosmology Primer FAQ: faster than the speed of light

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Are distant galaxies moving faster than the speed of light? Wouldn't that violate relativity?
[...] The "velocity" that cosmologists speak of between distant galaxies is really just a shorthand for the expansion of the universe; it's not that the galaxies are moving, it's that the space between them is expanding. If the distance isn't too great, this expansion looks and feels just like a recession velocity, but when the distance becomes very large that resemblance breaks down. In particular, it's perfectly plausible to have distant galaxies whose "recession velocity" is greater than the speed of light. [...]
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Old 23-May-2007, 07:17 PM
belcan belcan is offline
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Thanx 01101001, I got it now, even though I didn't get it
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Old 23-May-2007, 08:53 PM
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Hum,
So yes, it would be a milestone in the history of our universe, as important as the formation of hydrogen ... or the first stars lighting up, or the last blackhole evaporating... .

And because they have been distracted with some sort of anthropic argument it is that last point that they seem to have missed.
The last blackhole evaporating, or last particle transforming into radiation, is even further away in time, thousands of trillions of years in the future; But, when that happens, every single particle will be isolated. And it would be then that some would propose that all the conditions are met to create a new `bigbang` and a new universe. (Another milestone)

The Return to the Static Universe

See `Cyclic universe` or `time`

BTW, they have updated their original paper today (Version 2)
Read more (7kb, PDF)
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Old 30-May-2007, 06:54 AM
dasguptachandan dasguptachandan is offline
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Thumbs up our future

This theoory of 'Island Universe" is fasinating as well as terrible.Regarding this collision I got a very interesting and precise summery for next few trillion years in John Baez's website(week 252)http://math.ucr.edu/home/baez/this.week.html
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Old 30-May-2007, 07:59 AM
dasguptachandan dasguptachandan is offline
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Question about volume

Once an Island Universe is formerd we will be limited within a certain region of spacetime, will that volume be larger than now? , and after collision
can any part of it attain speed faster than light to enter other areas which we can't see now?
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Old 07-June-2007, 12:20 AM
Nick4 Nick4 is offline
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Cool

There is nothing to worry about. By the time 3 trillion years get here the earth might not even exist anymore because the sun is going to take over in about 5 billion.

But in 2-4 billion years i predict that we will be able to have close to light speed space travel down.
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