Mare white cracked spots craters craters grooves and

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Unformatted text preview: lows to form “Mare” White cracked spots: craters craters Grooves and ridges Grooves Jupiter’s Moons: Jupiter Callisto Callisto similar to Callisto similar Ganymede Ganymede Icy surface with more craters craters No signs of molten past No Moon Formation Moon Jupiter’s llarge moons get less dense as you Jupiter arge go out – going from iron, to rocky, to icy just going like planets in the Solar System like Jupiter probably had a disk around the hot young planets and formed regular moons like planets around a star planets Irregular moons (small, orbiting backwards) are probably captured asteroids are Saturn’s Moons: Saturn Titan Atmospheric Haze Titan has an atmosphere Titan 90% Nitrogen 10% Argon 90% Only moon to do so! Only Cold: Methane/Ethane can condense Cold: Methane/Ethane Rain? Methane/Ethane Coldness helps limit Atmospheric escape escape Huygens Probe to Titan, 2005 Huygens Huygens Probe Landing Huygens Methane/Ethane “seas” Water “rocks” Water Neptune’s Moons: Neptune Triton Triton is cold with a bumpy looking surface bumpy Icy, reflective only 37 K Icy, Little cratering: Probably cratering Probably resurfaced resurfaced Nitrogen jets, thin Nitrogen atmosphere Nitrogen Neptune’s Moons: Neptune Triton Triton is orbiting backwards: Retrograde backwards: This means it is spiraling in to Neptune Will be torn apart by Neptune’s tides Neptune Triton may have wrought havoc on other inner moons of Neptune moons Medium Sized Medium Moons Saturn (6), Uranus (5) and Neptune (1) have some medium sized moons medium Orbits from 3.1 to 60 planet radii planet Masses 0.0005 to 0.05 Earth’s Moon Earth Getting to Asteroid size Getting Medium Sized moons Medium Small enough that no longer as spherical (like Asteroids) spherical Heavily Cratered Heavily Occasional bright surface due to ice crystals crystals No Gas No Miranda (Uranus) Planetary Rings Planetary All four Jovian planets have rings All Saturn’s rings are the most prominent Saturn Big Question: What are rings? Saturn’s Rings Saturn Saturn’s rings are Saturn rings very thin: few 100m few How easy the rings are to see depends on how face on they are to reflect sunlight to Saturn’s Rings Saturn Saturn’s main rings extend from the planet Saturn main radius to 2 ½ planet radii There are several rings which vary in brightness and contain gaps: Divisions Divisions The inner rings are very faint The The outermost ring (outside main rings) is at 3 ½ to 5 planet radii Saturn...
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This note was uploaded on 04/10/2011 for the course ASTRONOMY 1f03 taught by Professor Wadsley during the Spring '11 term at McMaster University.

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