What was originally thought to be a planet orbiting the Fomalhaut star was probably just the fallout of a wild collision.

Why Can't We Find Planet 9? Deep in the outer reaches of our solar system, far beyond Neptune and Pluto, something massive is ...

At extreme pressures and temperatures, water becomes superionic — a solid that behaves partly like a liquid and conducts ...

We’ve sent spacecraft to every planet in the solar system, but none of them are truly safe to explore. Each world destroys ...

"Without Mars, Earth's orbit would be missing major climate cycles. What would humans and other animals even look like if ...

Discover why the solar system's planets are arranged as they are, shaped by formation conditions and planetary migration.

So far, humanity has yet to find its first "exomoon"—a moon orbiting a planet outside of the solar system. But that hasn't ...

Deep beneath the surface of distant exoplanets known as super-Earths, oceans of molten rock may be doing something ...

Scientists have discovered more than 6,000 planets beyond our solar system. What if some of them aren't planets at all, but ...

A rare triple conjunction of Venus, Mars and Mercury is happening on the opposite side of the solar system to where Earth is, ...

Saturn reigns supreme when it comes to the number of moons orbiting any solar system planet. Including the 128 ...

A solar conjunction occurs as Venus' orbit carries it into alignment with the sun and Earth. Venus will align with the sun ...