At last count, Jupiter has 95 moons, but the four main ones — Ganymede, Callisto, Io and Europa — were discovered in 1610 by famed Italian astronomer Galileo Galilei.

NASA's Juno spacecraft made a close flyby of Jupiter moon lo. See an animation of the images the probe captured created by ...

Possible microbes in the Mariana Trench hint at life on Jupiter’s moon. During the 2012 DEEPSEA CHALLENGE expedition to the deepest part of the ocean, scientists spotted fuzzy mats that may be ...

Legendary Apollo astronaut Rusty Schweickart and Mary Robinette Kowal, who created alternate-history astronauts in her Lady ...