"It’s incredible to think there was once a world this large." The post Scientists Find Chunk of Lost Planet in Desert ...

When we talk about rocky planets, we often imagine Earth: a dense metallic core, a silicate mantle, and a thin atmosphere.

A rare meteorite discovered in the Sahara Desert proves that our solar system almost had at least one extra planet. In a ...

A Jupiter-mass planet orbiting the millisecond pulsar PSR J2322-2650 completes a full year in roughly 7.8 hours, placing it ...

Four-and-a-half billion years ago, a massive world—possibly as big as the moon or even Mars—orbited our sun before crashing ...

Instead they circled a pulsar, the dead remains of an exploded star. Clearly nature excels at making planets, even under extremely hostile conditions. Planets like those in our solar system form ...

Mike Brown is convinced that beyond Neptune, at the far reaches of our solar system, there's an unseen giant planet. "This is the 5th largest planet in our solar system, lurking out there, waiting to ...

Researchers have developed the Smaller Than Earth Habitability Model (STEHM) to assess which planets can maintain ...

Forbes contributors publish independent expert analyses and insights. Leslie Katz covers the intersection of culture, science and tech. A yellowish-orange glow bathes Phainoterra, a planet of dramatic ...

This month, six planets in the solar system — Mars, Jupiter, Uranus, Venus, Neptune and Saturn — will appear in Earth's skies in a "parade of planets." Although the dark hours of Jan. 25 will be a ...

I’m a planetary scientist who was born the year of Sputnik’s launch. Over the course of my 40-year career, I’ve witnessed not one but at least five separate revolutions that fundamentally transformed ...