Recent flybys of the fiery world refute a leading theory of its inner structure—and reveal how little is understood about geologically active moons.

What color is moonlight typically, and what other colors can moonlight look like from our perspective on Earth?

NASA have found something new moving in our Solar System. Even thought it's not water, still a phenomenon worth of time ...

At last count, Jupiter has 95 moons, but the four main ones — Ganymede, Callisto, Io and Europa — were discovered in 1610 by famed Italian astronomer Galileo Galilei.

kilometers (124 miles) of Io in February, and transmitted them to Earth during the following eight months. To approach Io, the spacecraft had to enter a region of hazardous radiation around Jupiter.

This gas giant has some really unique features that make it stand out. If you’re curious about space, learning a few things ...

Jupiter isn’t alone in this category; Saturn, Uranus, and Neptune are also gas giants, though Uranus and Neptune are often ...

Europa Clipper is NASA’s bold mission to investigate whether Jupiter’s moon Europa could harbor life beneath its frozen ...

ESA's Mars Express orbiter captured footage of the Mars' moon Deimos pass in front of Ganymede, Europa, Jupiter, Io and ...

I’ve spent much of my long life studying — and trying to understand — the history of the universe. Along the way, I have been constantly reminded that science is essentially international: Science ...

Although artificial structures raised on the lunar surface will provide shelter, it would be helpful if the moon itself offered some natural defenses. A study published this month in Nature ...