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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

New Moons Adding to the clutter around Jupiter April 13, 2023

JUICE III A lot of help on the road to Jupiter April 12, 2023

JUICE II Ready to take a deep dive April 11, 2023

‘Juicy’ Mission Getting “juiced” for a trip to Jupiter April 10, 2023

More Moon, Venus, Jupiter A closer look at some big moons February 22, 2023

Moon and Jupiter Diving into a deep ocean December 1, 2022

Moon and Jupiter Grand names for a grand planet October 7, 2022

Moon and Jupiter The Moon and a mini solar system August 14, 2022

Pillan Patera Stirring up a giant volcano June 28, 2022

Moon and Planets Lots of little moons for giant planets June 27, 2021

Moon and Jupiter Busy volcanoes and lofty mountains May 31, 2021

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

Featured Images

Jupiter Bound April 10, 2023

Infrared image shows volcanoes on Io, a moon of Jupiter

Hot Spots December 15, 2022

hubble space telescope view of jupiter and europa

Busy Giant July 17, 2022

Cassini view of crescent Jupiter and Io

Deadly Duo November 11, 2021

Juno spacecraft view of Ganymede

Close Visit June 11, 2021

artist's concept of water erupting from europa

Salty Eruption November 14, 2020

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