The Fermi Gamma-ray Space Telescope has discovered the youngest known millisecond gamma-ray pulsar in an old globular cluster of stars. A pulsar is a type of neutron star that emits electromagnetic energy at periodic intervals; a millisecond pulsar does soe every one- to ten-milliseconds, or one one-thousandth of a second.. A neutron star is the closest thing to a black hole that astronomers can observe directly, crushing half a million times more mass than Earth into a sphere no larger than a city. This matter is so compressed that even a teaspoonful weighs as much as Mount Everest. Recent discoveries of more gamma-ray pulsars have pushed their number past 100.
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