Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory about the possibility of a giant ninth planet. The dwarf planet's existence ...

In the icy, dark expanse beyond Neptune, a cosmic fossil has surfaced that threatens to upset decades-old assumptions about the solar system’s secret structure. The new discovery of “Ammonite,” a ...

2017 OF201 is about one-third the size of Pluto, which was reclassified as a dwarf planet in August 2006, and "is likely large enough to qualify as a dwarf planet, and its orbit is extremely wide ...

Reuters. FILE PHOTO: Cutout images of all 19 detections of the newly identified trans-Neptunian object named 2017 OF201 are seen, from the Canada France Hawaii Telescope (CFHT) and the Dark Energy ...

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system. The object—which orbits out beyond Neptune—has been named "2017 ...

Just when you thought you knew all the worlds in the solar system, astronomers go and discover a new object that could rewrite the space map.. This icy world, temporarily named 2017 OF201, could ...

The mass of 2017 OF201 is estimated to be about 20,000 times smaller than Earth’s and 50 times smaller than Pluto’s. “We don’t know the shape yet.

That makes 2017 OF201 almost 30 times farther out than Neptune at its most distant point. This kind of orbit earns the object a spot in the category of extreme trans-Neptunian objects (ETNOs).

The minor world is dubbed 2017 OF201; the International Astronomical Union’s Minor Planet Center added the object to its catalog on May 21. Despite its classification, the planet measures ...

Named 2017 OF201, its diameter is about 435 miles (700 km) The object takes roughly 25,000 years to orbit the sun; It is among the solar system's furthest visible objects ...