That would make it thousands of times more massive than any moon orbiting a solar system plane  — so massive it could make ...

Astronomers have yet to find irrefutable proof for any natural satellites of exoplanets—so-called exomoons—but as circumstantial evidence accumulates and the list of candidates grows, the discovery of ...

WASHINGTON (Reuters) - Astronomers have pinpointed what appears to be the first moon detected outside our solar system, a large gaseous world the size of Neptune that is unlike any other known moon ...