Beyond Neptune lies the Kuiper Belt, a vast region of icy bodies offering crucial insights into the solar system’s formation.

Carrying out simulations to try and discover what best explains the orbits of these objects, the team found that a model that ...

Test your knowledge on our solar system, from the biggest and smallest planets to the behemoth mountain on Mars.

It's possible for our solar system to capture a rogue planet and give it a home as it hurtles through the galaxy, according ...

One possibility is that there is a Planet Nine but not the canonical one; instead it’s something considerably punier—Mars-size—and it sits elsewhere on the solar system’s outermost boundary.

Venus will pass to the north of the much-fainter bluish star Regulus (in Leo, the Lion) on the morning of Sept. 19; the planet and star will appear low in the east-northeast predawn sky, separated by ...

A planet parade is when several of our solar system's planets are visible in the night sky at the same time. There will be six planets visible this time around, including Venus, Mars ...

If planet X exists, it is likely a gas giant similar to Neptune. NASA/Caltech/R. Hurt (IPAC), CC BY Our solar system is a particularly crowded place. Millions of objects move within it, whether they ...