Astronomers have announced the discovery of a monumental interstellar object, designated 3I/Atlas, believed to be the largest ...

A mysterious cosmic traveler has found its way to the Solar System from the uncharted reaches of interstellar space. The rare ...

I/ATLAS, earlier known as A11pI3Z, is only the third interstellar visitor to be discovered passing through our corner of the ...

Such events occur roughly every one to two years, on average. Update: Today's livestream of the solar system planets will now begin at 12:30 p.m. EST (1730 GMT). Take a grand tour of the solar ...

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system. The object—which orbits out beyond Neptune—has been named "2017 OF201" by the ...

If there were one, that Planet Nine would "nudge the closest part of 2017 OF201's trajectory inward until Neptune flung it out of the solar system." Because 2017 OF201 is there, that could be an ...

Space. Tatooine-like planet outside the solar system may orbit twin stars. The exoplanet, which is about 120 light years away, appears to take an unusual path around two brown dwarfs.