23-May-2007, 06:56 AM
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Senior Member
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Join Date: Mar 2004
Posts: 11,432
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Quote:
Originally Posted by belcan
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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Sure, if you play loosely with words.
Preposterous Universe: Cosmology Primer FAQ: faster than the speed of light
Quote:
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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