A black hole infamous for strange features has once again baffled astronomers, this time with rapid X-ray flashes. What could they be?

These "near-dark galaxies" are rare and typically contain ... To put it in perspective, deep-sky objects above 22 mag/arcsec are considered faint, with a completely dark sky having a surface ...

A near-Earth object (NEO) is any small Solar System body whose orbit brings it into proximity with Earth. By convention, a Solar System body is a NEO if its closest approach to the Sun (perihelion) is ...