Free-floating planets, or as they are more commonly known, rogue planets, wander interstellar space completely alone. Saying there might be a lot of them is a bit of an understatement. Recent ...

So far, humanity has yet to find its first "exomoon"—a moon orbiting a planet outside of the solar system. But that hasn't been for lack of trying. According to a new paper by Thomas Winterhalder of ...

February may be the shortest month of the year, but it is packed with celestial events, according to a new skywatching update from NASA.

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

What do you call an object that has all the characteristics of a moon, but whose mass compares to that of a giant planet? The ...

Recent research suggests that Saturn's bright rings and its largest moon, Titan, may have both originated in collisions among its moons. While Cassini's 13-year mission expanded our understanding of ...

Stargazers can see six planets all in one evening during the second month of the year, especially Mercury, which is usually ...

Of the solar system’s planets, Saturn piques the human imagination with its signature rings and impressive moon count of 274. But compelling new research reignites theories of an ancient collision ...

A trio of planets accompanied the moon in the sky on Friday, Dec. 10. Jupiter, Saturn and Venus fell in line with the crescent moon in the southwestern sky shortly after nightfall, according to ...

Saturn's moon Mimas, just 250 miles wide, could have a liquid water ocean under its outer icy shell, according to new research led by Max Rudolph at UC Davis. If such moons are the right size, water ...