A comet makes a pit stop near Jupiter but will eventually get flung into interstellar space

In June 2019, the automated survey ATLAS (Asteroid Terrestrial-impact Last Alert System) found a new object moving against the background stars. Initially called 2019 LD2, it was thought to be an asteroid orbiting the Sun out near Jupiter. However, an amateur astronomer noticed it appeared to be fuzzy, not point-like, which means it was more like a comet: Icy material on the surface turning into a gas as it's warmed by the Sun.

Checking archived images, astronomers determined it had been "activ...