Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

Europe has committed to becoming climate-neutral by 2050. But how can we get there in a way that's technically feasible, economically responsible, and fair to all member states? Researchers from ...

NASA telescopes in Chile have discovered a comet from interstellar space, making its closest approach in October.

Its orbit is extremely elongated and takes 25,000 years to complete. 2017 OF201's size challenges ideas about a ninth planet in our solar system.

A possible cousin of Pluto seems to be circling the far reaches of the solar system. The dwarf planet candidate 2017 OF201 travels in a superwide orbit, with the sun relatively near one end of its ...

This new dwarf planet may exist at the edge of the solar system, possibly disproving Planet Nine's existence. This is the story of that newly encountered planet.

Astronomers have revealed new research showing that millions of new solar system objects are likely to be detected by a brand-new facility, which is expected to come online later this year.

A new Tatooine-like planet outside the solar system may orbit two failed stars, scientists reported Wednesday. Located about 120 light years away, the exoplanet appears to take an unusual path ...

Astronomers have detected the most promising signs yet of a possible biosignature outside the solar system, although they remain cautious.

Scientists may have found evidence of a ninth planet hiding out beyond Pluto, but is it actually Planet Nine?

Solar flares can affect us on Earth, and radiation from this flare caused a shortwave radio blackout. A map released by the ...