Pulsars and magnetars are types of neutron stars, the crushed core of a star that has exploded. Neutron stars crush half a million times more mass than Earth into a sphere no larger than Manhattan. ... more 
Pulsars and magnetars are types of neutron stars, the crushed core of a star that has exploded. Neutron stars crush half a million times more mass than Earth into a sphere no larger than Manhattan. Some of these objects spin at 43,000 revolutio less 
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SPACE.com | Photo By NASA
Wed, May 29, 2013 1:16 PM EDT