The mysterious "interstellar visitor" that was recently spotted whizzing through the solar system may be around 3 billion years older than our cosmic neighborhood, a new study suggests. If confirmed, ...

When Comet 3I/ATLAS entered our solar system last year—only the third known interstellar object to do so—astronomers took ...

Astronomers have been given the rare opportunity to study an extrasolar object after the recent discovery of the interstellar comet 3I/ATLAS. Experts tell Live Science how they are planning to observe ...

News Analysis An object said be a new planet on the fringes of the solar system isn't a true planet but probably an alien interloper from a distant star, says an expert on solar system formation. A US ...