The Giant Planets – “Gas Giants” Jupiter Saturn Uranus Neptune Mostly H and H compounds under very high pressure in interior + small rocky core.

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The Giant Planets – “Gas Giants” Jupiter Saturn Uranus Neptune Mostly H and H compounds under very high pressure in interior + small rocky core

Jupiter Distance 5.2 AU from Sun Diameter 11 x Earth Mass 318 x Earth Mean density 1.3 gm/cm 3 17 moons, 4 large terrestrial Galilean satellites Space missions Pioneer 10 & 11, 1973, 1974 Voyager 1 & Galileo 1996

Jovian atmosphere, cloud layers H, He Methane Ammonia Great red spot – large anti-cyclonic, high pressure region

Atmosphere and Interior From models based on Hydrostatic equilibrium Increasing temp and pressure inwards Rocky core – 10 – 20 Mearth

Magnetosphere Ring System

4 Galilean satellites Io Europa Ganymede Callisto These are terrestrial planets

Io - most active surface in solar system

Europa Smooth young surface, layer of ice, crustal faulting

Ganymede and Callisto

Saturn -- rings and Titan Distance 9.5 AU from Sun Diameter 9.4 x Earth Mass 95 x Earth Mean Density 0,7 gm/cm 3 18 moons, Titan largest Space missions Cassini-Huygens orbiter and lander on Titan 2005

Atmosphere and Interior

Rings 274,000 km across, < 1 km thick Thousands of narrow ringlets, individual particles of frozen gas, mostly H 2 O What formed the rings -- Roche lobe

Atmosphere, N and N compounds, methane From Cassini mission

Huygens Lander on Titan