The solar system is our cosmic neighborhood, made up of the sun and everything that orbits it — planets, moons, asteroids, comets, and even dust and gas. The order of the planets in the solar ...

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

Elon Musk is taking the long view. The billionaire SpaceX founder has long said that humanity needs to expand its footprint ...

Earth has four seasons, but do other planets in our solar system also have hot summer days and cold winter nights?

This is probably the most convincing evidence for Planet Nine so far. It is believed that this planet is five to ten times ...

Discovered in 1930, Pluto was long considered our Solar System's ninth planet, but was unseated in 2006 after the discovery ...

For years, astronomers have toyed with the idea that the Sun hides an extra planet so distant and dim that even the best ...

The exoplanet 2M1510 (AB) b makes an unusual orbit around a pair of brown dwarfs, objects bigger than gas-giant planets but ...

The Solar System consists of our star, the Sun, and everything bound to it by gravity; the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, along with dwarf planets like ...

To put that in perspective, this new planet at the outer rim of the solar system would be almost 20 times farther away from the sun than Pluto is. Pluto, which infamously lost its status as the ...

Astronomers may have found a candidate for Planet Nine. This planet is beyond Neptune. The finding could be the first ...

An international team of scientists led by a Rutgers University–New Brunswick astrophysicist has discovered a potentially ...