Potential new NASA mission would reveal the hearts of undead stars

Neutron stars have been called the zombies of the cosmos, shining on even though they're technically dead, and occasionally feeding on a neighboring star if it gets too close. They are born when a massive star runs out of fuel and collapses under its own gravity, crushing the matter in its core and blasting away its outer layers in a supernova explosion that can outshine a billion suns. A proposed mission called the Neutron Star Interior Composition Explorer (NICER) would unveil the dark heart of a neutron star.

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