Why is Pluto no longer a planet? Discover the real reason behind Pluto’s reclassification as a dwarf planet and the science that led to this change.

Pluto isn't alone—it's part of the Kuiper Belt with possibly hundreds of other planet-sized objects. Because Pluto hasn't achieved gravitational dominance in its region, the International Astronomical ...

Beyond Neptune lies the Kuiper Belt, a vast expanse of icy bodies that may hold clues to the solar system’s formation. These ...

Behind the planets in the solar system is the Kuiper Belt. An inventory of similar structures around other stars shows how unusual it is. A research team has used several telescopes to take images ...

Uranus has the craziest tilt in your Solar System. Its tilt is about ninety-eight degrees. That means its north pole is ...

Six planets are still aligned in London skies tonight (Sunday, January 26) and will remain so until about mid-February. So if you missed them at their peak last night, there is plenty of time to see ...

Asteroids, comets and Kuiper belt are bodies smaller than planets that orbit the sun. Asteroids are composed of metals and rock, whereas comets also contain ice and dust. The Kuiper belt is a ...

we wish Pluto was still a planet, too) could snare a moon that is around half its size. The team behind this research thinks that two frigid worlds located in the Kuiper Belt, a ring of icy bodies ...

Beautiful photos of the six planets aligned in the night sky have emerged online. Mars, Jupiter, Uranus, Neptune, Venus and ...

As the gatekeepers to the Kuiper Belt, Charon and Pluto are a unique double dwarf planet system. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...

Some are narrow rings, as in the canonical picture of a 'belt' like our Solar System's Edgeworth-Kuiper belt ... evidence that yet undetectable planets are present and their gravity affects ...

On this date, Jan. 19, 2006, the first probe ever destined to visit Pluto, its moons and other Kuiper belt objects launched ... year journey to the icy dwarf planet. This mission marked the ...