In 2016, a pair of astronomers made an exciting announcement: There might be a hidden planet about ten times the size of Earth lurking somewhere in the most distant part of our solar system, waiting ...

The solar system seems to be getting more crowded by the day as its once nine-world population gives way to a realm of planets, dwarfs and the dim and distant plutoids. But in reality, the solar ...

A newly found object may set a new record for the most distant dwarf planet in the solar system. The object, called V774104, lies about nine and a half billion miles from the sun, or two to three ...

Bumper car-like interactions at the edges of our solar system—and not a mysterious ninth planet—may explain the dynamics of strange bodies called “detached objects,” according to a new study. CU ...

Something very big, out beyond Neptune, is warping the orbits of small, icy objects circling our sun. Astronomers haven't seen it yet, but say the... Scientists Find Hints Of A Giant, Hidden Planet In ...

Scientists have been trying to find a hypothetical Planet 9 that may exist outside our known solar system based on the unusual orbits of certain dwarf planets. But those orbits might not require a ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. An illustration of confirmed dwarf planets and their moons. From left to right: Pluto (with ...

Astronomers have discovered three small, icy worlds orbiting the sun near Pluto, on the outer reaches of the solar system. The three newfound bodies are likely big enough to be rounded by their own ...