The moon greets Jupiter two days ahead of its full moon phase on Feb. 1.

Using data gathered by NASA's Juno Jupiter orbiter, scientists estimate that Europa's ice shell is about 18 miles thick — ...

While Io, the most volcanically active moon in the solar system, appears completely dry and devoid of water ice, its neighbor Europa is thought to harbor a vast global ocean of liquid water beneath ...

"What makes the event even more extraordinary is that it did not involve a single volcano, but multiple active sources." ...

On Jan. 10, Jupiter will shine at its brightest and largest in 2026, rising at sunset and glowing in the sky until sunrise The gas giant will reach a magnitude of -2.7, making it the fourth brightest ...

A comet from another star system will swing by Mars on Friday as a fleet of spacecraft trains its sights on the interstellar visitor. We already know a decent amount about how planets form, but moon ...

CAPE CANAVERAL, Fla. (AP) — The solar system has a new winner in the moon department. Twenty new moons have been found around Saturn, giving the ringed planet a total of 82, scientists said Monday.

Looking for a sky event this week? Check out our full Sky This Week column. February 3: Uranus stands still Io and its shadow ...

Jupiter has had its length and breadth measured again, and it turns out the giant planet is skinnier and shorter than ...