An illustration of how astronomers observed the Cygnus X-1 system from different angles, using the EarthÕs orbit around the sun to measure the perceived movement of the system against the background stars. (International Centre for Radio Astronomy Research via The New York Times)
NEW YORK: One of the biggest and first known black holes in the Milky Way galaxy is more massive than astronomers thought, a team of scientists announced on Thursday.
The finding throws a wrench into long-held models of how massive stars evolve on the way to the ultimate doom.Cygnus X-1, an unseen, X-ray-emitting object, and a fat blue star called HDE 226868 circle each other every 5.6 days.
Cygnus X-1 was one of the earliest celestial sources of X-rays ever discovered, in 1964, when astronomers began lofting cosmic Geiger…
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