Mouyuan Sun

The flare AT2018cqh in a dwarf galaxy turned out to be the trail of a star torn apart by a middleweight black hole. These objects are the missing link between tiny and giant black holes, and they are extremely hard to find. This discovery offers a new way to hunt for the invisible.

The star J2354, a few hundred light-years away, has a hidden companion that heats one side of the star. Observations of the star's wobble and light spectrum suggest the companion is a neutron star, firing winds that create a permanent hotspot. This proximity makes it one of the closest neutron stars

In the young universe, telescopes found many reddish dots. A new explanation: these are huge black holes that we see from the side. The gas disk around them blocks the most energetic radiation, allowing only dim red light and hydrogen glow. A similar object exists right in the Milky Way. If viewed f