To better understand Jupiter’s primordial stages, researchers turned to the tiniest of the planet’s 92 known moons. Almathea ...

For instance, Neptune migrated outward, switching places with Uranus, and pushed a lot of the small, icy bodies into the ...

All seven planets are rocky worlds, ranging from about the size of Mars to a little larger than Earth. Three or four of them reside within their star's habitable zone, meaning they orbit at the ...

All planets are born with a certain amount of heat ... While Mars started out similar to Venus and Earth, its smaller size meant that its gravity wasn't strong enough to hold onto the small ...

But a bigger size means a bigger “extended atmosphere ... “WASP-193b is an outlier of all planets discovered to date,” he said.

But thanks to new telescopes and methods in the past decades, we now know there are thousands and thousands of planets out there circling faraway stars, and they come in all sorts of shapes and ...