A hazy, ultra-light “super-puff” planet, Kepler-51d, is hiding its secrets and challenging how scientists understand planet formation.

Kepler-51d is the coolest and least dense of the planets in this planetary system. “We think the three inner planets orbiting ...

Using ground-penetrating radar, NASA's Perseverance rover has detected underground remains of an ancient river delta on Mars ...

The Perseverance rover has found tiny crystals that seem to be rubies or sapphires inside pebbles on Mars, where they have ...

Learn more about the Kepler-51 star system and some of the ''oddball" planets that reside there.

By plying its ground-penetrating radar in the depths of Mars’s Jezero Crater, this rover has found even older deltas buried beneath those seen on the surface from space ...

Greek mythology has given a name to a great many objects in our solar system. But perhaps one of the least well understood ...

No, I'm not describing some alien fantasy novel, I'm talking about Titan, Saturn's largest moon, which happens to share some ...

A newly studied exoplanet, Kepler-51d, is wrapped in an unusually dense layer of haze that may be hiding both what it is made of and how it formed ...

Kepler-51d is a giant, ultra-light “super-puff” planet wrapped in an unusually thick haze that’s blocking scientists from ...

Astronomers have taken a closer look at one of the strangest planets ever discovered, and it is raising more questions than ...

Astronomers have identified a strange new kind of exoplanet that challenges how scientists classify worlds beyond our Solar System. The planet, L 98-59 d, appears to contain a vast ocean of molten ...