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Galilean Moons

Galilean Moons . Maddie Barrett, Rachel Bell, and Rachel Bibb. Size. Galilean moons have a diameter of more than 200 meters. Galilean moons are the four largest moons orbiting Jupiter. Three of the Galilean moons are bigger than Earth’s moon and one moon are smaller than E arth’s moon.

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Galilean Moons

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  1. Galilean Moons Maddie Barrett, Rachel Bell, and Rachel Bibb

  2. Size Galilean moons have a diameter of more than 200 meters. Galilean moons are the four largest moons orbiting Jupiter. • Three of the Galilean moons are bigger than Earth’s moon and one moon are smaller than Earth’s moon.

  3. General Color and Unique Surface Features • Surface is yellow-red • Scientists think that the volcanic materials are sulfur and sulfur dioxide.

  4. How Long is a Day and a Year? • Io- Rotates in 42 hours (About 1 ¾ days on Earth) • Europa- Rotates in 85 hours (About 3 ½ days on Earth) • Ganymede- Rotates in 171.75 hours (About 7.15 days on Earth) • Callisto- Rotates in 400.8 hours (About 16.7 days on Earth) • Io- Revolves around Jupiter in 42 ½ hours (About 1 ¾ days on Earth) • Europa- Revolves around Jupiter in 85 hours (About 3 ½ days on Earth) • Ganymede- Revolves around Jupiter in 171.7 hours (About 1 week on Earth) • Callisto- Revolves around Jupiter in 396 hours (About 16.5 days on Earth)

  5. Density • Density decreases as distance from Jupiter increases. • Io- 3.55 g/cc ~ less dense than earth’s moon • Europa- 3.04 g/cc ~less dense than earth’s moon • Ganymede- 1.94 g/cc ~less dense than earth’s moon • Callisto- 1.81 g/cc ~less dense than earth’s moon

  6. Gravity • Io-1.8 m/s² • Europa- 1.32 m/s² • Ganymede- 1.43 m/s² • Callisto-1.24 m/s²

  7. Atmosphere Composition • Io has an atmosphere consisting mainly of sulfur dioxide. • Europa has an atmosphere composed mostly of molecular oxygen. • Ganymede has an atmosphere with oxygen atmosphere. • Callisto has an atmosphere containing carbon dioxide.

  8. Surface Composition • Io has a surface composition of volcanic material. • Europa has a surface composition with a 100km sheet of ice containing cracks and what is thought to be liquid water under it. • Ganymede has a surface containing various ridges and valleys. • Callisto has a surface that is densely cratered and possibly the most densely cratered in our solar system.

  9. Interior Composition • Io has an Iron sulfide core, outer silicate crust and partially silicate mantle. • Europa has a solid ice crust, silicate mantle and a metallic core • Ganymede has a cold ridged ice crust, outer warm ice mantle, inner silicate mantle, and metallic core. • Callisto has a surface of ice layer, possible liquid layer, and ice rock interior.

  10. Magnetic Fields • Io has a strong magnetic field. • Europa has a magnetic field similar to Io. • Ganymede has a weak magnetic field. • Callisto has a very weak magnetic field.

  11. Unique Features • Io has tidal forces from the other moons cause Io’s surface to move in and out 100m. • Europa has what is thought to be good conditions for extraterrestrial life. • Ganymede is the largest moon in moon in the solar system. • Callisto may be one of the most densely cratered moons in our solar system.

  12. Summary

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