When Earth is opposite Mars from the sun, it will appear full because you’re looking directly on the daylit side. But ...

A new study has proposed the existence of Planet Y, an alternative Planet Nine candidate that is smaller and closer to Earth ...

Exoplanet hunters Christopher Watson and Annelies Mortier explain the long search for a 'twin Earth' capable of sustaining ...

With water being so important to life on Earth, scientists often look for it on exoplanets. But some of those worlds might ...

Scientists are developing PoET, a new EU-funded solar telescope, to overcome stellar noise hindering the search for ...

Warm Jupiters are rewriting the rules of planet formation - showing eccentric orbits that stay strangely aligned with their ...

Just as Earth orbits the sun, most planets discovered beyond our solar system orbit a host star. But some are out there all ...

Did NASA find another Earth? Scientists look to the sky to find a copy of our planet, and some experts think they may have ...

NASA exoplanet hunter racks up bizarre worlds and exploding stars Some of the TRAPPIST-1 planets lie in the habitable zone, making the system an ideal laboratory for exploring the evolution of ...

A newly discovered space rock zoomed safely by Earth on Wednesday (Oct. 15) at only about a quarter of the average distance ...

A pairing-off of the brightest planet and a slender crescent moon will be the chief celestial attraction in the dawn sky ...

Some habitable worlds orbiting dead stars could be kept alive for aeons thanks to a quirk of Einstein’s theory of gravity ...