Giant planets are not rare per se — after all, we have four in our own solar system. Such large worlds are, however, rarely ...

Plus, an in-depth look at how the West Texas city of Seminole reacted when a measles outbreak tore through the region.

A possible new dwarf planet has been discovered at the edge of our solar system, so far-flung that it takes around 25,000 ...

Discovery of 2017OF201, a large trans-Neptune Object, challenges previous beliefs about the Kuiper Belt and hints at the ...

an unusual clustering of icy bodies -- including comets and dwarf planets -- which stretches from Neptune and outward toward interstellar space. Six known objects in the Kuiper Belt have ...

The solar system consists of our star, the sun, and everything bound to it by gravity: the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, along with dwarf planets like ...

Scientists have been searching for a ninth planet to explain the orbital eccentricities of Uranus and Neptune (and dwarf planets like Sedna and Pluto) for more than a century. For the past decade ...

a disk of comets and other small objects beyond the orbit of Neptune. In 2015, NASA's New Horizons probe passed Pluto and spotted signs of recent geological activity in the dwarf planet's thinning ...

There are five confirmed dwarf planets in the solar system: Ceres, Haumea, Eris, Makemake and the ex-planet Pluto.All of these planetary pretenders, apart from Ceres, are located in or around the ...

Pluto is one of the largest objects in the Kuiper Belt, a region beyond Neptune primarily filled with small, icy objects. Despite its reclassification from planet to dwarf planet in 2006 ...

Scientists have discovered a ring system around a small object beyond the orbit of Neptune, a surprising ... in question orbits Quaoar, a small dwarf planet that lies more than 4 billion miles ...

Quaoar is part of a collection of about 3,000 dwarf planets known as trans-Neptunian objects, which are beyond the orbit of the planet Neptune. Scientists are now wondering why the dense material ...