Rings of Saturn and Uranus
Rings of Saturn and Uranus
Rings of Saturn and Uranus
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<strong>Rings</strong> <strong>of</strong> <strong>Saturn</strong> <strong>and</strong> <strong>Uranus</strong>
<strong>Saturn</strong>’s <strong>Rings</strong> in Detail
Dusty <strong>Rings</strong> <strong>of</strong> <strong>Uranus</strong>
How <strong>Rings</strong> Are Created<br />
• Ring material must be<br />
replenished<br />
• <strong>Rings</strong> cannot last 4.6<br />
billion years due to<br />
atmospheric friction<br />
<strong>and</strong> collisions<br />
• <strong>Rings</strong> are continually<br />
created by destroying<br />
moons, comets,<br />
asteroids
<strong>Rings</strong> <strong>of</strong> Jovian Planets
Lots <strong>of</strong> Moons
Tidal Haating
Europa
Ganymede
Callisto
Titan
Medium Moons <strong>of</strong> <strong>Saturn</strong>
Mir<strong>and</strong>a
Triton
Remnants <strong>of</strong> Rock <strong>and</strong> Ice<br />
• Asteroid: a rocky leftover planetesimal<br />
• Comet: an icy leftover planetesimal<br />
• Meteoroid: a planetesimal or other object<br />
that l<strong>and</strong>s on Earth<br />
– Meteor (shooting star): a flash <strong>of</strong> light caused<br />
by a meteoroid entering the atmosphere<br />
– Meteorite: a piece <strong>of</strong> meteoroid that reaches the<br />
ground (rocky or metallic material)
Asteroids
Questions:<br />
• Where did all the<br />
leftover planetesimals<br />
outside the belt go?<br />
• Why are there Trojan<br />
Asteroids?<br />
• Why are there<br />
asteroids in the belt<br />
instead <strong>of</strong> another<br />
planet?
Orbital Resonance
Asteroid Hunting
Asteroids Reflect Sunlight
Rotation <strong>and</strong> Shape <strong>of</strong> Asteroids
The Biggest Asteroids
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