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

Scientists found proof that a giant early planet existed in the solar system 4.5 billion years ago.

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

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 ...

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 ...

On this planet, clouds emerge every morning and disappear by night as astronomers study the giant exoplanet WASP-94A b using ...

Astronomers spotted a potential Earth-size rocky world orbiting a white dwarf, suggesting a future in which our planet outlives its star. By Jonathan O’Callaghan In six billion years the sun will ...

The Earth-size planet HD 137010 b has a ‘50% chance of residing in the habitable zone’ of its sun-like star, scientists say Astronomers have discovered a potentially habitable new planet about 146 ...

On ‘Star Wars day’, researchers more than double the number of potential known ‘circumbinary’ planets like the fictional Tatooine, home to Luke Skywalker ...

Every planet in our solar system is essentially round. But out in the universe, are there any planets that aren't spherical? Technically, planets are round, by definition; they need to have enough ...

Scientists have discovered a bizarre planetary system where a rocky world orbits farther out than giant gas planets, defying long-standing theories of planet formation. The finding hints that some ...

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 ...