A study suggests over 1 million interstellar objects are hiding in the Oort Cloud, possibly from Alpha Centauri.

"Our Sun (Sol) is marked by a black hexagon, and its orbital path is indicated by a grey solid line (top row only). Alpha ...

Oumuamua and Comet Borisov in 2017 and 2019, respectively, created a surge of interest. What were they? Where did they come ...