The world’s premier space observatory has spotted a mysterious and huge, free-floating planetary-mass object that’s “just 20 light-years from Earth,” NASA announced. Researchers recently used the ...

Saturn was already the reigning champion in the moon department. Now, with 274, Saturn has more moons than all the other ...

If you find Jupiter, you’ll likely see four small dots to the side of the gas giant: they are the Galilean moons, four of the 95 natural satellites around the Solar System’s largest planet.

Apropos of its reputation for living large and betting big, Jupiter is the largest planet in our solar system. Jupiter is the Roman equivalent of god daddy Zeus, and we can think of the planet as ...

The ringed gas giant Saturn has officially replaced Jupiter as the planet in our solar system with the most moons. The International Astronomical Union officially recognized 128 new moons orbiting ...

A huge haul of 128 newfound satellites might be a hint of past collisions in the planet’s orbit, or something else.