Numerical simulations affirm that Ammonite’s orbit has been stable at least since 4.5 billion years ago, implying it is a primordial relic from the beginning of the Solar System’s epoch.

Scientists have found evidence of a previously-undetected dwarf planet at the edge of the solar system. The object, dubbed 2017 OF201, follows an extreme, oblong orbit, taking some 25,000 Earth ...

Astronomers say they have evidence that there may be a hidden planet in our Solar System. Named 'Planet Y', the Earth-sized ...

The solar system has many more moons than the one we can see in the sky. But how many do we actually know about? And how many ...

Learn how a possible ninth planet, the theoretical Planet X, could have acquired its wide orbit in the outer Solar System - a process that's also applicable for other planets.

Most planet-forming disks have warps that can lead to planets on inclined orbits, which could explain where the tilt of Earth ...

The Solar System has a total of 419 known moons around planets. If we count dwarf planets, asteroids, and other worlds, the ...

Tatooine-like planet outside the solar system may orbit two failed stars, scientists say Located 120 light years away, the planet appears to take an unusual path around two brown dwarfs, whipping ...

A Jupiter-like planet has been found orbiting a young sun-like star in a solar system far away in what is a potentially ...

A new "Tatooine-like" planet outside the solar system may orbit two failed stars, scientists reported Wednesday.Related video above: The dark energy pushing our universe apart may not be what it ...

NEW YORK (AP) - A new Tatooine-like planet outside the solar system may orbit two failed stars, scientists reported Wednesday. Located about 120 light years away, the exoplanet appears to take an ...