Astronomy Review for 3rd Unit

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University of Toronto St. George
Astronomy & Astrophysics
Michael Reid

Astronomy101 Prof Reid Final Unit ReviewMoons and Rings of Jovian Planets112 113 A Wealth of Worlds Satellites of Ice and Rock 112The Jovian planets are surrounded by 150 moons in orbit which range from 3 size categories such as Large 1500kmmedium 300kM1500kmand small 300km These moons always have the same face facing the planet they orbitSmall moons are most likely captured moons or asteroidsLargeMedium moons are most likely formed by accretion within the disks of gas surrounding individual Jovian planetsJupiters Galilean moons are extremely geologically active Io The most volcanically active world in the solar system due to tidal heating from Jupiter heating up the interior of the moon Due to Ios unique elliptical orbit due to orbital resonance from nearby moons and Jupiter the tidal forces on Io are extremely strong as if being pulled on by all directions and thus create tremendous amounts of energyEuropa The water world ice water covers the surface of Europa and there is strong evidence of a subsurface of liquid waterGanymede Is the largest moon in the solar system and similar to Europa is covered by ice water Callisto The outermost moon it is essentially a heavily cratered iceball and is most identical to the initial predictions made for Jupiters moons before further analysis Saturns unique MoonsTitan Has a nitrogenrich atmosphere which is so thick that it blocks out the surface of the planet Titan has an admirable greenhouse gas affect although the surface temperature is fairly cold What makes Titan unique is the fact that due to its unique chemical compositions of its atmosphere and its cold surface temperature there is a chance there may be life on TitanMedium Sized Moon Saturn has 6 medium sized moons with only Mimas which does not shows little evidence of past volcanism or tectonics Uranus Moons Uranus has 5 medium sized moons and like other Jovian moons these 5 moons are all predominantly composed of ice Neptunes Triton Triton is known to the coldest world in the solar system and orbits Neptune backward at a high inclination to Neptunes equatorevidence that it had been captured rather than formed Geology in comparison to size and composition Icy and small moons are more geologically active than
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