Science What made a star explode? NASA now can sift through its entrails.

Until now, researchers have had to rely on computer simulations to explain what happens moments before the blast that rips a star apart. But NASA's orbiting X-ray observatory NuSTAR lets scientists glimpse conditions at star's core.

By , Staff writer

NASA/AP/File

Sifting through the cosmic ashes of Cassiopeia A, an exploded star some 11,000 light-years away, astronomers have for the first time uncovered direct evidence of the conditions that existed at the star's core mere minutes before it blew up.