A NEW Earth-sized planet has been discovered in a faraway constellation – and it would kill any astronaut who dare travel ...

The newfound exoplanet, called Kepler-139f, is a gigantic world roughly twice the mass of Neptune and 35 times the mass of Earth, and it takes 355 days to orbit its star, astronomers reported in a ...

Astronomers are watching a giant exoplanet spiral toward its star - offering a rare, real-time look at how planets die.

Espinoza is a leader in the new massive James Webb Space Telescope study of rocky worlds, specifically to find out if planets ...

A fifth planet has been detected within the habitable zone of a neighboring star, where conditions could perhaps support ...

Looking at this another way, if we'd known of a star with a planet that took as long as Jupiter to orbit, and started observations back in the mid-1990s, when the first exoplanets were discovered ...

A new study sheds light on what Jupiter, often called the "architect" of the solar system, was like in the beginning. The giant planet has dramatically changed.

This week in space: Obama wants a Mars shot, you can help NASA search for gravity waves via the magic of distributed computing, and a Jupiter-class planet with rings so huge, they'd nearly reach ...

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.