Speed of universe’s expansion remains elusive

Discrepancy between measures of Hubble constant suggests influence of some astronomical unknown

SN 2011fe

In August of 2011, researchers discovered SN 2011fe, a type 1a supernova 21 million light-years away in galaxy M101 (images show the galaxy before and after the supernova, with the supernova circled at right). Studies using type 1a supernovas as “standard candles” to measure how fast the universe expands (the Hubble constant) produce a result in conflict with other data used to infer the cosmic growth rate.

NASA, Swift, Peter Brown, Univ. of Utah

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