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 ...

Pictured here is an artist’s depiction of a two-star system called HD 113766, where NASA believes a rocky, Earth-like planet is forming some 424 light-years away.

Yet, recent space missions and planetary research have uncovered a surprising truth: the weather on planets throughout our solar system, and even beyond, often mirrors what we experience here on Earth ...

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.

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 ...

Astronomers have been scouring the outer solar system for signs of a hypothetical ninth planet for almost a decade, without success. However, we may finally be on the cusp of finding it, experts say.

Many of these worlds are closer in size to the largest planets in our solar system, like Jupiter or Neptune, and orbit very close to their host stars. But rogue planets are likely much smaller.

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 ...

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 ...