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Jupiter's Moons

Jupiter has more than 60 known moons. The four largest, known as Galilean moons for their discoverer, Galileo Galilei, are Io, Europa, Ganymede, and Callisto. Ganymede is the largest moon in the solar system.


Jupiter's Moons February 19, 2016


Jupiter February 10, 2016

Featured Images

Loki Patera, the largest volcanic feature on Io

Hot Lake September 21, 2017

Io and Jupiter

Volcanic Connection May 7, 2017

Composite view showing plumes of water eruption from Jupiter's moon Europa

Wet Moon September 26, 2016

Jupiter above Europa

Water World July 8, 2016

A mosaic of spacecraft images shows the varied surface of Ganymede

Hiding an Ocean June 20, 2015

View of Loki Patera, a lake of molten rock on Io, a moon of Jupiter

Hot Lake March 29, 2015

Hubble Space Telescope view of Jupiter, Ganymede

Layer-Cake Moon August 15, 2014

Europa orbiter mission concept

Fresh Idea July 3, 2014

Composite Galileo image of Jupiter's volcanic moon Io

Jovian Adventure August 30, 2013

Jupiter's Great Red Spot and the planet's four largest moons

An Eyeful of Moons January 2, 2012

Galileo spacecraft mosaic of Ganymede, largest moon of Jupiter

Two-Toned Moon December 5, 2011

The giant volcano Pele erupts on Jupiter's moon Io

Fire Mountain October 13, 2011

Artist's concept of global ocean on Jupiter's moon Europa

Water World September 16, 2011

Radio Programs

Moon and Jupiter A lake that isn’t made for swimming September 21, 2017

Last Discovery Picking out a new moon September 9, 2017

Moon and Jupiter Adding to a big family of moons August 25, 2017

Moon and Companions Heating up a Jovian moon March 13, 2017

Moon and Jupiter Big moons in an alien sky December 21, 2016

More Moon and Jupiter Changing tides on distant moons November 24, 2016

Moon and Jupiter Freezing out a thin atmosphere October 27, 2016

Moon and Jupiter Giant oceans around a giant planet July 8, 2016

Moon and Jupiter Danger from giant volcanoes June 11, 2016

Moon and Jupiter A big moon takes a beating January 26, 2016

Moon and Jupiter The master of a busy domain December 3, 2015

Moon and Jupiter Plunging into a hidden ocean June 19, 2015

Moon and Jupiter Dipping into a giant hot tub March 28, 2015

Moon and Jupiter Clouds of dust around a giant planet November 12, 2014

Moon and Jupiter The heat of a twisted moon September 18, 2014

Fresh Ideas Looking for fresh ideas July 2, 2014

Moon and Jupiter Big geysers on big moons May 2, 2014

Lithopanspermia Catching a ride to the outer solar system March 30, 2014

Moon and Jupiter A giant, icy moon January 13, 2014

Moon and Jupiter An adventure traveler’s idea of heaven August 29, 2013

Soothing Moon Stirring up some epsom salts May 25, 2013

Moon, Jupiter, and Aldebaran Jupiter’s large adopted family February 17, 2013

Moon and Jupiter A large, close-knit planetary family February 16, 2013

Jovial Water Worlds Giant oceans around a giant planet September 26, 2012

Moon and Companions II Dipping our toes in a giant ocean September 6, 2012

More Venus and Jupiter Worlds with and without companions March 11, 2012

Moon and Jupiter The master of a busy domain January 1, 2012