Trans-Neptunian objects (TNOs) are icy bodies that vary widely in size, from large dwarf planets like Pluto and Eris—each ...

On this day 35 years ago, NASA's Voyager 1 spacecraft took a picture that changed how we see our planet. The iconic "Pale ...

In 2015, two astronomers from Caltech presented evidence that six objects past the orbit of Neptune were bunched together in a way that suggested they were being "herded" by something with a large ...

The brighter of the two, provisionally named S/2002 N5, boasts a size of about 23 kilometers and requires almost nine years to complete an orbit around Neptune. Dr. Sheppard and his colleagues ...

Kuiper Belt, well past the orbit of Neptune (artistic illustration). There may be an undiscovered planet in the outer solar system whose presence is revealed by the strange orbit of objects beyond ...

Orbiting the Sun at a distance of 4.5 billion kilometres - more than 30 times further out than the Earth - Neptune is a dark ... was only discovered in 1846 after calculations of Uranus's orbit ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar system's planets onto a different course.

2023 — A team reveals the eventful migration history of planets bordering the Hot Neptune Desert, these extrasolar planets that orbit very close to their ... New Webb Image Captures Clearest ...

These are bodies of ice and rock that orbit the sun well past Neptune and Pluto, and they’re large, all more than 1,000 kilometers wide. In fact, with a width of more than 2,300 km, Eris rivals ...

For Neptune, in its wide and distant orbit at about 30 AU, the difference between the perihelion and aphelion is 0.5 AU, according to the Royal Greenwich Observatory. Dwarf planet Pluto ...