Interstellar objects may be about to change from astronomical curiosities into a measurable population. That shift matters becausethe Solar System has so far offered only two confirmed examples of ...

A cosmic traveler from beyond our solar system is making its closest approach to Earth this week, offering astronomers and stargazers a fleeting opportunity to witness a visitor from another star ...

A few days ago, an inscrutable interstellar interloper made its closest approach to Mars, where a fleet of international spacecraft seek to unravel the red planet’s ancient mysteries. Several of the ...