Add Yahoo as a preferred source to see more of our stories on Google. An illustration of our solar system showing the planets far closer together than they are in reality in order to represent the all ...

For a very long time, it was thought that the planets in our solar system represented the basic model of the universe. Rocky planets were found near the Sun, followed by gas giants further out from ...

Picture a world where ice does not melt, even while the ground glows with temperatures hotter than molten metal. Far beyond our solar system, astronomers discovered a planet that seems to ignore the ...

Add Yahoo as a preferred source to see more of our stories on Google. An illustration of a Jupiter mass planet migrating through a protoplanetary disk. (CREDIT: Graduate School of Arts and Sciences, ...

Two newly confirmed "super-puff" planets are so diffuse that they are less dense than cotton candy, despite being about the size of Jupiter. Their rare orbital relationship and enormous, lightweight ...

A mysterious "rogue" planet has been observed gobbling six billion tons of gas and dust a second—an unprecedented rate that blurs the line between planets and stars, astronomers said Thursday. Unlike ...

Hot Jupiters rank among the strangest planets astronomers have ever found. They are gas giants as massive as Jupiter, yet they race around their stars in just a few days. Since the first such world ...

A thick layer of haze around the ultra-low-density planet Kepler-51d likely obscures not only the strange planet's composition, but also its origin, according to a new study. A team led by Penn State ...

First look: For more than a decade, GJ504b has been something of an oddity – easy to spot, hard to understand. The planet orbits a sun-like star about 57 light-years from Earth and has stood out since ...