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

New discoveries of objects in the Kuiper Belt have also presented challenges for the Planet Nine theory. The latest is known ...

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, ...

When most of us left school there were still 9 planets – but we’ve come a long way since Pluto’s demotion. Here’s what’s next on the space agenda.

Is there life on planets other than Earth? For generations, scientists have puzzled over the question, searching for planets that might have the right conditions both inside and outside the Milky ...

Astronomers have discovered a rare solar system in the Milky Way with six planets orbiting in perfect rhythm like a cosmic orchestra.

All solar system planets circle our sun with slightly tilted orbits — and a new study shows even distant planetary systems in quiet neighborhoods have orbital tilts, too.

The smallest and largest planets that form our solar system range incredibly in temperature, composition, geology, and of course size.

EarthSky.com explains how seven planets in our solar system will be visible in the night sky this week.