On Feb. 22, 2017, scientists announced the discovery of TRAPPIST-1, an alien solar system with at least seven Earth-sized planets. See pictures of the discovery here. Skip to main content ...

When most of us think about theweather on other planets, we imagine extreme conditions—boiling acid rain, methane snow, or ...

A recent study has revealed that super-Earth exoplanets, worlds that are larger than Earth but smaller than Uranus or Neptune, are far more common in the universe than previously believed.

A stunning photo of the recent "parade of planets" shows Mercury, Mars, Jupiter, Saturn, Uranus and Neptune in alignment over Earth. It was captured from the U.K. on June 1.

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

Learn about the different planets in our Solar System. Find out their size, temperature and distance from the Sun in this Scotland Second Level Science article.

The European Space Agency on Wednesday released images taken in March using three of Solar Orbiter's onboard instruments. They show the sun's south pole from a distance of roughly 40 million miles ...

Does our solar system have a new dwarf planet? ... they identified 2017 OF 201 in 19 different images, ... Pluto’s orbital extremes are 29½ times the Earth-Sun distance at its closest and 49⅓ ...

Images from James Webb Space Telescope reveal more of the universe 05:27. NASA's James Webb Space Telescope has captured its first direct image of a planet located outside of our solar system.

The Sun is orbited by eight planets, at least five dwarf planets, tens of thousands of asteroids, and around three trillion comets and icy bodies. Although not all objects of the solar system are ...