WASHINGTON (Reuters) - Jupiter, the solar system's largest planet, may have been smacked head-on by an embryonic planet 10 times Earth's mass not long after being formed, a monumental crash with ...

Explore seven factual aspects of Jupiter, including its size, moons, rotation, atmosphere, rings, formation, and magnetic field based on NASA findings.

A newly discovered exoplanet more than 1,200 light-years from Earth has three times the mass of Jupiter and is the new "king" of its solar system. Known as Kepler-88 d, it replaces Kepler-88 c as the ...

Planetary scientists have long wondered why Mars is only about half the size and one-tenth the mass of Earth. As next-door neighbors in the inner solar system, probably formed about the same time, why ...