Black hole belches radiation long after eating a star

This is an artist’s depiction of what supermassive black hole AT2018hyz might look like. There could be an accretion disk around the black hole with a tail of material flying outward. In addition, there could be a powerful jet that’s perpendicular to the accretion disk. Image via DESY/ Science Communication Lab/ University of Oregon.

• A supermassive black hole called AT2018hyz ripped apart a star in 2018 and then unexpectedly began emitting strong radio waves 2.5 years later.
• The...