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One Star Once Orbited Inside the Other in this Bizarre Binary System.
Astronomers have spotted a pulsar in a binary system, taking about 3.6 hours for the stars to orbit one another. Their orbit is so close that, from our vantage point, the pulsar’s radio signals vanish for roughly one-sixth of each cycle—blocked by the companion’s interference. Researchers think that the more massive star died first, exploding as a supernova and collapsing into a neutron star, passing within the atmosphere of the other. It took about 1,000 years to blow away the envelope of material.
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