When a planet transits a star, a space telescope like NASA’s TESS can monitor the resulting dip in brightness.
In this case, however, the astronomers observed an X-ray transit.
The binary system is emitting X-rays out into space, which suggests its black hole or neutron star is in the process of consuming a nearby star.
And something appears to be temporarily blotting out the X-rays for about three hours, which could be a planet passing between us and the binary.
However, the researchers acknowledge more work will need to be done before any conclusions are drawn.