The hunt for Planet Nine continues as new discoveries make the Solar System’s biggest mystery even harder to solve. Is there ...

Pluto has long been one of the most debated celestial bodies in our solar system. Once classified as the ninth planet, it was redefined in 2006 as a dwarf planet, a decision that still sparks ...

Add Yahoo as a preferred source to see more of our stories on Google. Illustration showing a brownish, jupiter-like exoplanet in space, with its yellow host star in the background. Trends in the way ...

Growing up, I was taught that there were nine planets in the solar system. That all changed in 2006, when the International Astronomical Union voted to demote Pluto’s status to that of dwarf planet.

Researchers may have discovered a gas giant orbiting the star Alpha Centauri A, and it appears to be in the star's habitable zone. Reading time 3 minutes Exoplanet hunters have had an eye on Alpha ...

Caltech researchers have found evidence of a giant planet tracing a bizarre, highly elongated orbit in the distant solar system. The object, which the researchers have nicknamed Planet Nine, has a ...

TUCSON, AZ. — The University of Arizona has unveiled groundbreaking images of young planets using a new instrument, MagAO-X, that offers unprecedented detail. Astronomers at the University of Arizona ...