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.

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 ...

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.

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

In our solar system, little rocky Mercury is the planet orbiting closest to the sun, perpetually fried by solar radiation seven times more intense than what we experience on Earth.

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.

Astronomers have confirmed the existence of four planets orbiting a star less than 6 light-years away with help from some of the world's most powerful telescopes.

A new theory could explain the origin and properties of systems of rocky super-Earths and their relationship with the terrestrial planets of the solar system.

Jupiter is our solar system's biggest planet by far. It used to be twice as large: Study A recent study found that Jupiter was once twice the size that it is now, making it big enough to swallow ...

A rocky planet that circles a small star nearly 40 light-years from Earth is hot and has little or no atmosphere, a new study suggests. The finding raises questions about the possibility of ...

A team of astronomers used the powerful James Webb Space Telescope to capture new images of a "super-Jupiter" planet – the closest planet of its huge size that scientists have found.