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    • Mona Evans

      Internal structure of Io, Europa, Ganymede and Callisto. © based on NASA images. More about the Galilean moons in Mona Evans, "Jupiter's Galilean Moons"

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    Jupiter and Its Moons Photograph courtesy NASA This family portrait, a composite of the Jovian system, includes the edge of Jupiter (with the Great Red Spot visible) and Jupiter's four largest moons, known as the Galilean satellites. From top to bottom are Io, Europa, Ganymede, and Callisto. The smallest of these four moons, Europa is about the size of Earth's moon.

    Io is the first Galilean moon of Jupiter, it is slightly larger than Earth’s moon.  Io experiences intense tidal heating due to its elliptical orbit and orbital resonance with Europa and Ganymede.  This makes Io the most geologically active moon in our solar system.

    Damian Peach (UK): Jupiter with lo and Ganymede (Winner of the Astronomy Photographer of the Year 2011 Contest)

    The sizes of Jupiter's four major moons in contrast to Jupiter's Great Red Spot. From top to bottom, the moons are Io, Europa, Ganymede and Callisto. Image credit: NASA/JPL/DLR

    April 20, 1999: While hunting for volcanic plumes on Io, NASA's Hubble Space Telescope captured these images of the volatile moon sweeping across the giant face of Jupiter

    Star Size Comparison | Astronomy: Outer Planets and Large Moons

    Awesome Photo! Image Credit & Copyright: Cristian Fattinnanzi Explanation: Moon meets Jupiter

    Hubble Discovers Water Plumes Over Europa

    Gibbous Europa-Although the phase of this moon might appear familiar, the moon itself might not. In fact, this gibbous phase shows part of Jupiter's moon Europa. ESA and NASA have together started preliminary development of the Europa Jupiter System Mission , a spacecraft proposed to better study Europa.

    See article: Science Potential from a Europa Lander, R.T. Pappalardo, S. Vance, et al. (Full summary of the science of a Europa lander concept, as developed by the NASA-commissioned Science Definition Team) online.liebertpub...