For the first time, astronomers have managed to weigh a planet that is not bound to any star, a lonely world drifting through ...

Planetary size was determined pre-spacecraft by measuring the planet's angular diameter and its distance from Earth (in AU, later converted to terrestrial units after the AU was accurately measured ...

A new study published in The Astronomical Journal has revealed an astonishing possibility: free-floating planets, long considered cosmic castaways, may not be as solitary as once thought. Using the ...

At a young age, we're told how the sun warms Earth and makes life possible. That idea sticks with most of us for life. But when we want to understand things more thoroughly and we dig more deeply, we ...

Many of the most interesting bodies in our Solar System aren’t planets, but the moons that orbit them. They have active volcanoes, hydrocarbon oceans, geysers, and moon-wide oceans buried under icy ...