Persephone is one of the worlds that only exist in imagination land. It popped up in the heads of the people from French ...

Two decades ago, the International Astronomical Union—which defines and names celestial bodies—redefined the criteria for ...

On August 24, 2006, our solar system lost a planet. It wasn't by cataclysmic destruction, but rather by the vote of the International Astronomical Union, which declared that Pluto, considered ...

So far, humanity has yet to find its first "exomoon"—a moon orbiting a planet outside of the solar system. But that hasn't been for lack of trying. According to a new paper by Thomas ...

The discovery provides a precious peek into the dawn of our own solar system as well The discovery provides a precious peek into the dawn of our own solar system as well The discovery provides ...

An artist's impression shows the "inside out" planetary system around the star LHS 1903. - ESA An exoplanetary system about 116 light-years from Earth could flip the script on how planets form, ...

Rogue planets sound like rare travelers among the stars, freed from the gravitational constraints of a host system, left to ...

It’s not every day you get a chance to spot multiple planets with the naked eye—but this month, you can. Venus and Mercury are both visible in the sky, offering a rare glimpse ...

A very small body, far from the sun in an icy outer realm of the solar system, has mysteriously grown an atmosphere — and ...