Astronomers have spotted an unusual 'inside-out' planetary system where a rocky world seems to have formed far beyond the realm typically reserved for gas giants.

Lying between Mars and Jupiter is a massive ring of rock debris—the asteroid belt. Now thin, it’s fading away gradually. In a new study, planetary scientist Julio A. Fernández of Uruguay’s Universidad ...

The International Astronomical Union (IAU) currently recognizes five dwarf planets in our solar system, though there are likely many more. The most famous of the bunch is Pluto, way out beyond the ...

Orbiting between Mars and Jupiter is an enormous ring of space rocks. The region, known as the asteroid belt, is home to an estimated 1.9 million asteroids that are larger than 1 kilometer in diameter ...

The asteroid, around 100 feet in diameter, is speeding toward our planet at about 22,000 miles per hour, according to NASA.

Between the orbits of Mars and Jupiter lies a ring-shaped region called the asteroid belt, home to the vast majority of our solar system’s space rocks. The asteroid belt is as old as the solar system ...

Aliens may have been closer to Earth than first thought. New research from NASA reveals that Ceres, the dwarf planet in the asteroid belt between Mars and Jupiter, harbored the right conditions to ...

The asteroid belt was a vast collection of rocks that was believed to be the remains of a planet that never formed. During the formation of the solar system 4.6 billion years ago, Jupiter's ...

Millions of asteroids, not a planet, exist in the asteroid belt. The asteroid belt's total mass is only a small fraction of the Moon's mass. Meteorite analysis suggests the asteroids didn't originate ...

A hidden ocean on dwarf planet Ceres may have churned up some of the ingredients for life relatively recently. The largest object in our Solar System’s asteroid belt, dwarf planet Ceres, hides small ...