More pocked with craters than any other object in our solar system, Jupiter's outermost and second-biggest Galilean moon, ...

Callisto, the third largest moon in the entire solar system, orbits Jupiter from about 1.2 million miles away. The rocky ...

NASA’s Galileo spacecraft, which was designed to study the large, gaseous planet Jupiter and its moons, first caught hints of ...

Research Fellow Dr. Babak Bakhit has encountered one of his most challenging projects to date—contributing to the European ...

The presence of an ocean leaves open the possibility that it could host life. Another nearby moon, Europa, is also considered ...

Callisto, one of Jupiter’s largest moons, looks like a boring, crater-filled world. It doesn’t seem to have much going on ...

Your guide to the Giant Red Spot, those large ocean-bearing moons and the conditions which could support life on the planet ...

Plus: Stopping asteroids from hitting Earth, solving climate change with fertilizer and building strength by eating grapes.

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

Skywatchers on Thursday evening, Feb. 6, will notice an eye-catching pairing-off between two of the brightest objects in the nighttime sky. The moon, nearly two nights past first quarter and appearing ...

The zodiacal light shines in the evening as the Moon reaches Last Quarter and skims past Spica and Antares in the sky this ...

Two planets stand side by side as the evening twilight continues to delight and colorful stars shine in the sky this week.