If you were to look at a giant picture of space, zoom in on the Milky Way galaxy, and then zoom in again on one of its outer spiral arms, you’d find the solar system. Astronomers believe it ...

Lovejoy likely hails from the Oort cloud, a distant shell of icy objects thought to surround the solar system. It’s one of the roughly 4,000 known comets among the billions estimated to exist in ...