Scientists have discovered a bizarre planetary system where a rocky world orbits farther out than giant gas planets, defying ...

An illustration of the James Webb Space Telescope as it orbits the sun in our solar system, 1 million miles from Earth. Credit: ASA GSFC / CIL / Adriana Manrique Gutierrez The James Webb Space ...

Looking for a sky event this week? Check out our full Sky This Week column. May 24: Egeria slides on by After reaching superior conjunction midmonth, Mercury is increasing in visibility and should be ...

To be a planet, NASA says an object must be big enough that its gravity has cleared away any other objects of a similar size near its orbit around the Sun. I can understand how something can clear ...

NASA’s Psyche spacecraft just used Mars as a giant slingshot on its journey to a mysterious metal world that could reveal what’s hidden inside planets like Earth.

Astronomers using NASA’s James Webb Space Telescope have uncovered a rare world unlike anything in our solar system — a giant planet about the size of Saturn with surprisingly Earth-like temperatures ...

Preliminary results of a study presented at the recent European Geosciences Union General Assembly in Vienna indicate that ...

A planet that is about the size of Saturn, but with a temperature more like Earth's, has an atmosphere rich in methane, ...

Neptune’s third-largest moon, Nereid, could be an intact survivor from the planet’s original satellite system, upending ...

Engineers are increasingly turning to the concept of "biomimicry" for the next generation of Mars robots.

TOI-199 b, a rare temperate giant planet, sits between scorching hot Jupiters and frozen gas giants, and JWST has found ...

What would it be like to live on a super-Earth?