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Physics, Astronomy & Cosmology / Re: What happens to light as universe expansion slows down?
« on: 02/01/2016 11:14:15 »Quote
So the universe is expanding at an increasing rate. According to the law of conservation of energy this shouldn't be happening? The universe must be getting extra energy from somewhere hence Dark Energy?
That's right; the observations that we have suggest that the Universe is expanding, and that the rate of expansion is
increasing although this inflation is being powered by unknown physics. This is reconciled by invoking the as yet undefined, unknown and unmeasured theoretical entity dubbed "Dark Energy" as the driving force. We know that this must exist in one form or another, but no one has yet detected it or, for that matter, knows how to go about detecting it...
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