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Jupiter's Moons

Jupiter has almost 80 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

Radio Programs

Moon and Jupiter Cold volcanoes on cold worlds August 28, 2020

Moon and Jupiter A system of watery worlds June 7, 2020

Moon and Jupiter A moon with a lot going for it January 21, 2020

More Venus and Jupiter Powerful lights on a giant planet November 24, 2019

Moon and Jupiter High tides on a hot moon October 3, 2019

Moon and Jupiter Fishing for an alien ocean April 22, 2019

Moon and Planets Heating up a Jovian moon January 29, 2019

Moon and Jupiter A cool spray from a cold moon August 16, 2018

Moon and Jupiter Digging into a giant moon July 20, 2018

Moon and Jupiter Slippery ice for a moon of Jupiter February 6, 2018

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

Featured Images

Possible ice plumes from Europa

Cold Volcanoes? August 28, 2020

Ganymede and Jupiter

Complicated Moon January 21, 2020

Io photographed in front of Jupiter

Hot Moon October 3, 2019

Galileo view of Europa

Alien Ocean April 22, 2019

Voyager 2 views of the surface of the Jovian moon Ganymede

Moonscapes July 20, 2018

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