Friday, October 28, 2016: This nebula may be the gassy remains of a dead star that exploded long ago, but its heart is still beating. A neutron star, or the crushed remains of the star that once was, spins rapidly at the nebula’s core while spewing bursts of energy into space. NASA’s Hubble Space telescope took several exposures of the Crab nebula in 2012 to create this image. Its green glow comes from a filter used for observations. — Hanneke Weitering
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