Astronomers have been monitoring the black hole for years, primarily since 2018 when the mass was observed changing its properties with a major X-ray outburst. Between 2022 and 2024, astronomers ...
In 2018, a galaxy about 270 million light-years away from Earth exhibited a major increase in activity. It quieted down again by 2020 -- only to dramatically increase its output again in 2023. At that ...