Large hailstones made of ammonia may explain why the gas is missing from large pockets of Jupiter's atmosphere.

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

The hybrid motor combines solid fuel with gaseous oxygen to generate a powerful exhaust stream, mimicking the conditions of a real lunar lander.

NASA's Juno spacecraft has resumed normal operations after entering safe mode twice during its 71st close approach to Jupiter on April 4.

"It's amazing that after 35 years, Hubble still holds a unique capability as a top workhorse for science discoveries and ...

DARPA is seeking proposals for a small lunar orbiter that could be used to test operations in very low orbits while ...

This week is International Dark Sky Week. Lights that are aimed upwards or not properly capped illuminate the atmosphere and ...

Scientists have spotted a molecule linked to life in the atmosphere of K2-18b using the James Webb Telescope. Here is a look ...

Data from previous missions had made planetary scientists wonder whether, rather than just pockets of melt, Io contained a 31-mile (50-kilometer) deep layer of magma: a moon-wide ocean of molten rock.

Boom, boom, boom Katy Perry is looking for an adventure brighter than the moon, moon, moon. In fact, she might even see it on ...

The photo at left is an enhanced-color image of Neptune from the Hubble Space Telescope. At the right, that image is combined ...

Meanwhile, the 96 bags of waste still sitting on the Moon remain a stark reminder of the logistical and ethical challenges of space exploration. With this new initiative, NASA hopes to usher in ...