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"Speed of Light"
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<blockquote data-quote="freyar" data-source="post: 6279152" data-attributes="member: 40227"><p>That's basically right. Suppose we have two galaxies that are relatively "nearby" us (but still millions of light-years away) that happen to be the same distance away but in opposite directions. We would translate the redshift of each galaxy into a speed v moving away from us (v stands for the size of velocity, ie speed). Either of those galaxies would see us moving at v away from them and the other galaxy moving at 2v away. (Remember, I don't really mean a velocity in the normal sense here.) If we look at a 3rd galaxy which is twice as far away at the first two, it would have an apparent speed of 2v away from us. </p><p></p><p>That's the behavior expected if the universe is expanding at a fixed rate, which roughly holds for the universe that's nearby us (on cosmological scales). However, if you look really far a way, you find deviations from that linear distance-speed relation (which is called the Hubble law). That deviation is due to the fact that the expansion of the universe is changing rates. For example, gravity from normal matter acts to slow down the expansion. We also discovered in 1998 that there is some other source of energy (often called "dark energy") that acts to increase the expansion rate of the universe, and that effect is winning. The expansion of the universe is actually getting faster.</p></blockquote><p></p>
[QUOTE="freyar, post: 6279152, member: 40227"] That's basically right. Suppose we have two galaxies that are relatively "nearby" us (but still millions of light-years away) that happen to be the same distance away but in opposite directions. We would translate the redshift of each galaxy into a speed v moving away from us (v stands for the size of velocity, ie speed). Either of those galaxies would see us moving at v away from them and the other galaxy moving at 2v away. (Remember, I don't really mean a velocity in the normal sense here.) If we look at a 3rd galaxy which is twice as far away at the first two, it would have an apparent speed of 2v away from us. That's the behavior expected if the universe is expanding at a fixed rate, which roughly holds for the universe that's nearby us (on cosmological scales). However, if you look really far a way, you find deviations from that linear distance-speed relation (which is called the Hubble law). That deviation is due to the fact that the expansion of the universe is changing rates. For example, gravity from normal matter acts to slow down the expansion. We also discovered in 1998 that there is some other source of energy (often called "dark energy") that acts to increase the expansion rate of the universe, and that effect is winning. The expansion of the universe is actually getting faster. [/QUOTE]
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