Callisto

Our Moon is more unique than you might think.

NASA's Juno spacecraft beams back new images of Jupiter's atmosphere in greater detail than ever before.

A NASA spacecraft is ready to set sail for Jupiter and its moon Europa, one of the best bets for finding life beyond Earth.

Elon Musk doesn't expect the next Starship test flight to occur before late August.

Planetary scientists have been searching the cosmos for liquid water. Here are the most promising water worlds in the solar system and beyond.

To test its autonomous software, the JUICE mission team pretended to fly the spacecraft past Jupiter's fourth moon, and passed the exam with flying colors.

The next year of science for the James Webb Space Telescope has been selected. It includes remote galaxy observations and, at last, a hunt for exomoons

Since the Juno mission's most recent flyby of Jupiter and one of its moons, more detailed pictures of the gas giant have appeared in the official repository....

The evidence is mounting.

Saturn's moon Mimas is known for its uncanny resemblance to the dreaded Death Star in the original "Star Wars" movie. Astronomers said on Wednesday that...

A deep ocean exists beneath the icy, cratered surface of Saturn's moon Mimas, according to a new analysis of data from NASA's Cassini mission.

A bright half moon just one day past its first-quarter phase meets up with Jupiter in the night sky on Thursday (Jan. 18) just below Aries, the Ram.

Planetary scientists using NASA's Juno spacecraft have detected hydrated sodium chloride, ammonium chloride and sodium/ammonium carbonate, as well as organic compounds on the surface of Jupiter's moon Ganymede.

The James Webb telescope just detected carbon dioxide on this Galilean satellite, one of the nearby worlds studied for extraterrestrial life

Europa is one of the objects in our solar system that's under observation for potentially having the conditions to support life.

The moon and Jupiter will be just under the feet of Aries the Ram, in the night sky on the evening of Monday, Aug. 7. With the right binoculars, you could...

The JUICE mission's ultraviolet spectrograph gathered data for the first time, revealing our galaxy's bright stars.

Phosphorus, an essential ingredient for life as we know it, has been detected for the first time in water samples that can be traced back to Enceladus, an...

Opioid drugs such as morphine and fentanyl are like the two-faced Roman god Janus: The kindly face delivers pain relief to millions of sufferers, while the grim face drives an opioid abuse and overdose crisis that claimed nearly 70,000 lives in the U.S. in 2020 alone. Scientists like me who study pa...

A radar antenna on a newly-launched European mission to Jupiter has finally deployed after weeks of effort to loosen a stuck pin.