The solar system lost its ninth planet back when Pluto was demoted to a dwarf planet, but research might indicate that there ...

Astronomers have uncovered a massive new trans-Neptunian object, 2017 OF201, lurking at the edge of our solar system. With an ...

Astronomers have directly spotted a rare young planet, WISPIT 2b, still forming within the gap of a dusty ringed disk around ...

On January 24th, 1986, Voyager 2 swept past our system’s seventh planet, Uranus, on its way through the solar system. It was the first and last time we ...

Uranus is unique in the solar system for its highly tilted rotation axis, which is nearly parallel to its orbit. The planet essentially rolls around its orbit on its side.

The origin of the differing tilts in the orbits of the planets in our solar system may have been revealed through the ...

The Hubble Space Telescope time-lapse captured footage of Jupiter, Saturn, Uranus and Neptune. Credit: SCIENCE: NASA, ESA, Amy Simon (NASA-GSFC), Michael H. Wong (UC Berkeley) / VISUALIZATION: Joseph ...

PLANET MAKER. In this artwork showing the early solar system, an enormous dust disk stretches around the Sun and serves as a breeding ground for new planets as material clumps together.

How, when and where to see as many planets as possible from planet Earth this week—with detailed sky-charts to help.

From the scorching surface of Mercury to the icy edges of Neptune, our planetary neighborhood is full of wonders. The order of the planets isn’t just trivia—it tells a story about temperature, ...

According to a new proposal, the solar system has 12 planets instead of the familiar 9, with several dozen more to come.