The European Space Agency spacecraft nicknamed Juice—for Jupiter Icy Moons Explorer—is on a historic mission to study three of Jupiter's moons
, along with the volcanically active moon Io, pictured here, were discovered by Galileo more than four centuries ago and are among the nearly 100 moons orbiting Jupiter, according to the National Aeronautics and Space Administration.Following the launch, Juice separated from its rocket and made contact with mission controllers on Earth.
A view of Jupiter's moon Europa created from images taken by NASA's Galileo spacecraft in the late 1990s. Photo: NASA/Reuters But the European Space Agency chose to focus on Ganymede for the closest inspection because it is the largest moon in the solar system—slightly bigger than Mercury—and the only one with its own magnetic field.Earth and other planets have such fields, which shield them from cosmic radiation and solar particles. Ganymede also contains a vast amount of liquid water.
A view of Jupiter's curving horizon and Callisto and Io , captured by NASA's Juno mission, Nov. 29, 2021. Photo: NASA/JPL-Caltech/SwRI/MSSS Juice’s anticipated mission end date is 2035, when the spacecraft will likely run out of the propellant that enables mission scientists to control it from Earth.
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