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So in 1929, Edwin Hubble looked up in the night sky and saw the galaxies moving away from us, those two times further were going two times faster, and, those three times further were going three times further, and so on. |
So in 1929, Edwin Hubble looked up in the night sky and saw the galaxies moving away from us, those two times further were going two times faster, and, those three times further were going three times further, and so on. |
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| + | <u>==References== </u> |
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| − | ==Backround Radiation== |
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| + | <u>[http://en.wikipedia.org/wiki/Cosmic_background_radiation Wikipedia on the background radiation] </u> |
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| − | Cosmic background radiation is [[Electromagnetic radiation|<u>electromagnetic radiation</u>]] from the sky with no discernable source. The origin of this radiation depends on the region of the [[Electromagnetic spectrum|<u>spectrum</u>]] that we are observing. One component is the [[Cosmic microwave background radiation|<u>cosmic microwave background radiation</u>]]. This component is [[Redshifted|<u>redshifted</u>]] [[Photons|<u>photons</u>]] that have freely streamed from an [[Timeline of the Big Bang|<u>epoch</u>]] when the [[Universe|<u>universe</u>]] became transparent for the first time to radiation. Its discovery and detail observations of its properties are considered one of the major confirmations of the <u>Big Bang. </u> |
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| + | <u>[http://www.astro.ucla.edu/~wright/cosmology_faq.html#BBevidence The evidence for the big bang.]</u> |
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Revision as of 16:30, 12 January 2013
The Big Bang was an expansion of space-time between 10 and 15 Ga.
The expanding universe
When Albert Einstien formulated his theory of general relativity, his equations demanded that the universe expand or contract.
So in 1929, Edwin Hubble looked up in the night sky and saw the galaxies moving away from us, those two times further were going two times faster, and, those three times further were going three times further, and so on.
==References==