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Hubble and the light-year

May 2013: Why we should stick to more understandable distances.
bob_berman_2009
How can we grasp the enormity of space? One thing is sure: We should at least make our units of measurement as intuitive and friendly as possible.

We often fail. Take, for example, cosmic expansion, the Hubble constant. In October, the highly respected Carnegie Observatories determined that its value is 74.3 ± 2.1 kilometers per second per megaparsec. The science media reported this verbatim.

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