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Astronomy #2

Test 2

95% of things learned about ss are learned from? vision
full moon always rises when sun sets
Mercury -cratered, remains due 2 no atmosphere -drastic temp change due 2 no atmosphere -closest to sun but not hottest -scarps on surface(not from geo activity) *compression of crust *not much geo here, needs hot interior *geo old, due 2 low geo activity
Venus -brightest thing in sky(not moon/sun) -lots of CO2, runaway/greenway effect -sulfuric acid rain -rotates slowest (opposite) *no coreolis effect=no spiral storms *200mph winds cause surface change -geo young (erosion from rain, volcanos) -mostly CO2
Mars -Argon=noble gas (tells us about abundance in early martian atmosphere)(thicker) -biggest volcano in ss (olympus mons) *missouri, not active for millions of years -a lot of geo features -young -water erosion evidence (flow at some point) #moon not r
Inner Planets smaller, shorter orbits hotter, rocky
Outer Planets 5AU away until first one gaseous -have rings
Jupiter -has more mass than all planets combined -gives off more energy than it takes *more mass=more heat -rotates more than 2X times faster than Earth -Galilean moons(oceans except io)
JMoon #1 (Callisto) -furthest moon -erosion(sublimation) -tidally heated the least by Jupiter SUBLIMATION=solid turns to gas
JMoon #2 (Ganymede) -second furthest -tidal heating stretches surface, causing ice to freeze & unfreeze
Jmoon #3 (Europa) -freeze/unfreeze -possible salt water ocean under ice -hospitable
Jmoon #4 (Io) -closest to jupiter -active sulfur geyser volcano *interacts with Jupiter magnetic field *gives aurora at poles (only moon to not have ocean)
Saturn -famous rings *best theory: a moon approached Roche limit
SMoon (Titan) -thicker than Earths atmosphere -has nitrogen -has methane at triple point *contains DNA traces
Uranus -has rings -tilted almost 90 degree from orbit *took moons with it *maybe big collision (anomaly)
Neptune -knew where to look for it before found *something was perturbing uranus' orbit, wobbling it. -about same rate of rotation as earth
Nmoon (Triton) -more methane in atmosphere than mars
Pluto -out of plane of ss, tiny -predicted by Bode's law
Bode's Law -math relation to predict location of planets from the sun -kuiper belt
Formation of galaxy -supernova caused kick to start gravitation -hydrogen fuses with helium -Jupiter has most angular momentum -ice and gases get pushed out -pieces of similar material morph together -hydrogen is most common element in universe
Created by: jp_Salas