Triton is thought to have started life out here, along with hundreds of other dwarf planets including Pluto and its moon ...

Before there was astronomy, there was astrology, attempting to divine mystic meaning from the motions of stars and planets ... The Dutch astronomer Jan Oort (soon to be famous for studies of the solar ...

Scientists say a celestial object discovered decades ago is actually twins orbiting each other. The discovery was published ...

The Oort Cloud’s residents may be a reason why life ignited on Earth; crashing on our planet eons ago, these ice bodies may have supplied at least some of the water that all life requires. At the same ...

the first known brown dwarf discovered 30 years ago. Brown dwarfs are sometimes called failed stars because they're lighter than stars, but heavier than gas giant planets. This object appeared too ...

a cosmic cloud so colossal it surrounds the sun and eight planets as it extends trillions of miles into deep space. The spherical shell known as the Oort Cloud is, for all practical purposes ...

Astronomers hypothesize that a long-ago dwarf galaxy dubbed Loki may have merged with the Milky Way when our galaxy was in ...