Astronomers have detected a rare pattern in the X-ray bursts coming from a neutron-star system no more than 16,300 light-years away. That star system, MAXI J1621−501, first turned up on Oct. 9, 2017, ...
NASA's Hubble Space Telescope has observed a mysterious X-shaped debris pattern and trailing streamers of dust that suggest a head-on collision between two asteroids. Astronomers have long thought the ...
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