Scientists are intrigued after spotting a highly unusual celestial object lurking at the very edge of our solar system.

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system.

The International Astronomical Union’s Minor Planet Center, which catalogs new moons and other small bodies in the solar ...

In 1979, the group Foreigner recorded the song “Head Games.” They could have been singing about the constellations Hercules ...

A pair of groundbreaking NASA studies, published in Nature, have unveiled new insights into the interiors of the Moon and the ...

Analyzing gravity data collected by spacecraft orbiting other worlds reveals groundbreaking insights about planetary ...

So which planets in our solar system have rings?All four giant planets — Jupiter, Saturn, Uranus and Neptune — sport these ...

"Rings are mostly made of ice and small rocks," said William Saunders, a planetary scientist at NASA's Langley Research ...

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The definition was seen as a demotion of Pluto from the category of planet to the category of dwarf planet, but it also meant that celestial bodies considered to be minor suddenly became popular.