Refined Hubble Constant Narrows Possible Explanations for Dark Energy

A NASA Hubble Space Telescope observation has refined the measurement of the universe's present expansion rate to a precision where the error is smaller than five percent. The new value for the expansion rate, known as the Hubble constant, is 74.2 kilometers per second per megaparsec (error margin of plus or minus 3.6). The results agree closely with an earlier measurement gleaned from Hubble of 72 plus or minus 8 km/sec/megaparsec, but are now more than twice as precise.

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