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| planet without magnetic field |
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| satellite with magenetic field |
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ganymede
generated by subsurface ocean |
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nobel prize, obama, gore
WHAT |
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distance outside planet 2.5 times sun's radius
inside which large satellites fall apart |
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satellite of jupiter
volcanoes emit sulfur sometimes come off as ions, caught by magnetic feilds of jupiter sweeps around forms plasma torus |
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| neutral collection of particles |
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| moon moving away from earth |
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Definition
| yes. measured with reflectors and lasers |
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| been launched, headed for distant comet |
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points at which gravitational force is balanced
ex: gravity of sun and jupiter is balanced at trojan asteroid
2 points, equal points along orbit in either direction |
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| magnetic axis and rotation axis |
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Definition
earth, jupiter aligned pretty much
uranus, neptune: rotational axis displaced from rotational axis by large amount |
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magnetic connection between io and jupiter create auras
different from plasma torus (connects satellite to poles of planet) |
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55 earth days = 2/3 of orbital period
why? gravity of sun slows its rotation |
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outer shell of earth
mosaic of plates, move sideways |
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visitied comet wild 2
comet visited by stardust spacecraft
imaged nucleus + brought piece of comet back
composed of organic molecules
jets of water vapor |
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Definition
warming of a planet beyond that it would from sunlight
due to molecules in atmosphere trap heat
CO2 + water |
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very thick
92 X of surface pressure of earth
traps heat, melts surface to past melting point of lead
"runaway greenhouse" |
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main belt
near-earth orbit
trojan
kirkwood gaps (jupiter's gravity is repetitive) gaps in main asteroid belts. |
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apparent backwards motion of someplanets against backround stars
mars, jupiter |
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| moon passes in front of another object |
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| light of moon is blocked by earth |
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| discovery of rings of uranis |
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stellar occultation
light breifly dipped in symetrical way |
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not uniform, dense clumps in some place
stellar occultation didnt work here because of that |
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mercury
long cliffs caused by surface shrinking
not found on other planets |
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explained orbit of planet
planets orbit sun in elipses rather than circles
planet moves faster when close to sun
orbital period increases with proximity to sun |
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| 4 moons of jupiter in orbit around something other than earth |
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saturn's rings composed of smaller rings (ringlets)
induced by small moons
(like a rock thrown in pool of water) |
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| strange: speed does not very with distance from planet |
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| spins same direction as orbit |
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| which planet spins backward |
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Definition
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Term
| why is neptune and venus same temp even though its farther |
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Definition
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Term
| ashtenosphere (zenosphere?) |
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Definition
| layer on which lithosphere slides on earth |
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| clouds of uranus and neptune |
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4 billion years old
created soon after moon was |
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Term
| which side of moon has more maria |
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Definition
near side
thicker crust on far side |
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Term
| 2 unique features on venus |
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Definition
arachnids and chronae
pent up heat cant get up, shatters surface |
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smooth,
resurfaced recently |
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