Beyond the orbit of Neptune, in the cold and nearly empty reaches at the frontier of the solar system, astronomers suspect a large planet may be hiding in the dark. No telescope has ever photographed ...

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A study recently submitted to The Astronomical Journal continues to search for the elusive Planet Nine (also called Planet X), which is a hypothetical planet that potentially orbits in the outer ...

When 'Oumuamua traversed our solar system in 2017 it was the first confirmed Interstellar Object (ISO) to do so. Then in 2019, Comet 2l/Borisov did the same thing. These are the only two confirmed ...

NASA plans to build larger solar sails that can generate more thrust. A new unique composite carbon fiber booms, the ACS3 system has the potential to support sails as large as 2,000 square meters, or ...

April 23 (UPI) --Rocket Lab launched NASA's new composite solar sail into space where it will undergo weeks of testing, using sunlight to propel it through the solar system. The solar sail technology ...

Add Yahoo as a preferred source to see more of our stories on Google. This image of Pluto was made after the New Horizons spacecraft flew past the dwarf planet on July 14, 2015, from a distance of ...

NEW YORK (AP) — A new Tatooine-like planet outside the solar system may orbit two failed stars, scientists reported Wednesday. A US-Russian space crew lands safely in Kazakhstan after an 8-month stint ...