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What's Dark Energy?

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Posted by John Morgan Powell on February 8, 2001 20:27:16 UTC

I think I understand the argument for dark matter, but what do you mean by dark energy?

The evidence for dark matter is astronomical.

Some stars in galaxies and galaxies in superclusters of galaxies have velocities that appear to be greater than the escape velocity based on the visible matter in galaxies and superclusters of galaxies. However, these "escape velocity" objects aren't apparently escaping, because they're still orbiting. If there's a lot more, as yet unknown, matter than we can see then that could explain why they're not escaping.

Also, the rotational velocity curves of spiral galaxies implies more matter in them than is accountable by the known forms.

What's dark energy?

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