Bizarre new planet is largest known rocky world, 40 times as massive as Earth. The bulky object—possibly the core of a failed gas giant—challenges what astronomers think about how planets form.

The largest rocky planets, called "super-Earths," are about twice as wide as Earth. "In comparison, Wasp-17b has a radius which is equivalent to 22 times that of Earth," Ulmer-Moll said.

This gives it a density about the same as Earth’s, implying that it is likely rocky in composition. This makes CoRoT-7b the only confirmed rocky extrasolar planet, and therefore the largest ...

TRAPPIST-1 g is the largest of the worlds, with estimates placing it at around 1.1 times the mass of Earth. If the planets are gas giants, they would retain their original, hydrogen-rich atmosphere.

One of the oldest stars in Earth's home galaxy might be hosting a hot, rocky planet, according to a paper published In January 2021. TOI-561b has an average surface temperature of over 3,140 ...

Exoplanets orbit stars outside of our solar system. Sub-Neptunes refer to planets between the size of our solar system's largest rocky planet, Earth, and the smallest gas giant, Neptune.

A new study modeled the chemistry of TOI-270 d, an exoplanet between Earth and Neptune in size, finding evidence that it could be a giant rocky planet shrouded in a thick, hot atmosphere. TOI-270 ...

Jupiter is already the biggest planet by far in our solar system, but new research suggests it was somehow once even larger than it is now. Twice as large, in fact. To put that into context, those ...

WASHINGTON, June 25 (Reuters) - In addition to providing a trove of information about the early universe, the James Webb ...

The slope of the gap trends downward, with most of the largest rocky worlds nestling close to their stars, suggesting the planets started out with thick atmospheres that their stars blew away. V ...