'Closest black hole' system found to contain no black hole

In 2020 a team led by European Southern Observatory (ESO) astronomers reported the closest black hole to Earth, located just 1,000 light-years away in the HR 6819 system. But the results of their study were contested by other ...

Indian astronomers investigate X-ray binary GRS 1915+105

Using the AstroSat spacecraft, astronomers from India have observed an X-ray binary system known as GRS 1915+105. The satellite allowed the researchers to conduct a comprehensive study of this object, yielding essential information ...

Quasi-periodic oscillation detected in Cygnus X-1

Using the Hard X-ray Modulation Telescope (HXMT), astronomers from Shanghai Astronomical Observatory in China have detected a low frequency, quasi-periodic oscillation in a black hole high mass X-ray binary known as Cygnus ...

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