The value for the expansion rate is 73.8 kilometers per second per megaparsec. It means that for every additional million parsecs (3.26 million light-years) a galaxy is from Earth, the galaxy appears to be traveling 73.8 kilometers per second faster away from us.

NASA’s Hubble Rules Out One Alternative to Dark Energy | Science Blog

How Did the Universe Start? (Or: Shooting the arrow of time backwards WILL give you a headache!!!)

An excellent overview of the competing views of what might have preceded the Big Bang. Including links to all the original papers, if you can understand any of it.

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