When they compared the planets to the models, they found “that a significant fraction of their volume – up to half of it – should be made of materials that are lighter than rock but heavier ...

combinations of rock and gas might suggest the planet stayed in the place where it formed. "We're not really sure what they're made of, or even how they formed." Want more science and tech news ...

A faraway gas giant planet that's famous for being strangely "puffy" appears to have clouds that are made of tiny bits of sand. The sand likely acts as water does on Earth, falling like rain ...

The revelation seems to indicate that the planet formation model favored by scientists may be overly simple. A team led by researchers from Northwestern University in Illinois made this discovery ...

"These are definitely not Earth-like planets." Hundreds of sub-Neptunes have been discovered. "What these sub-Neptunes are made of is an active topic of research in the field since there are ...

Two far-off planets are likely made of water, according to research conducted using NASA's Hubble and Spitzer telescopes.The so-called "water worlds" are orbiting a red dwarf star, the smallest ...