Skip to main content  Cosmic wow, a rare exploding star!  By Meg
Urry January 24, 2014 -- Updated 1751 GMT (0151 HKT) NASA's
NuSTAR telescope array generated the first map of radioactivity
in the remnants of an exploding star, or supernova. Blue in this
image of Cassiopeia A represents radioactive material. Click
through to see other wonders of the universe. NASA's NuSTAR
telescope array generated the first map of radioactivity in the
remnants of an exploding star, or supernova. Blue in this image
of Cassiopeia A represents radioactive material. Click through
to see other wonders of the universe. Wonders of the universe
Wonders of the universe Wonders of the universe Wonders of the
universe Wonders of the universe Wonders of the universe Wonders
of the universe Wonders of the universe Wonders of the universe
• In one of the nearest big galaxies, M82, a rare type of
supernova exploded   • Meg Urry: Its uniform luminosity makes it
valuable in measuring cosmic distance   • She says finding
supernovae has led d