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The Mystery of the Absent Black Hole

By Dave, on August 19th, 2010

Where’s the black hole? That’s what astronomers are asking as they gaze upon the burned-out remnant of a stellar explosion some 16,000 light-years away in the southern constellation Ara. The defunct star once held at least twice the mass necessary to create a black hole when it exploded as a supernova, yet somehow only an extremely magnetic, asteroid-sized object known as a magnetar remains.

Physics
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