Since astronomers captured the bright explosion of a star on February 24, 1987, researchers have been searching for the squashed stellar core that should have been left behind...
Among the cosmic rays that normally immerse the Earth, scientists say there are too many high-energy positrons, the antimatter counterparts of electrons...
Legions of scientists have studied and taken images of the Crab Nebula -- in fact, it's one of the most-studied object in space. But until now, astronomers have never been able to glimpse the object at the heart of the massive...
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