UT Arlington ASTR 1345 - The Gas Giants (2 pages)

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The Gas Giants

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The Gas Giants


Talks about the gas giants: Jupiter's moons, Saturn, Uranus, Neptune

Lecture number:
Lecture Note
University of Texas at Arlington
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ASTR 1345 1st Edition Lecture 22 Outline of Last Lecture I Mars Moons II Voyager Missions III Galileo Mission IV Cassini Mission V Jupiter A Jupiter s Interior B Jupiter s Atmosphere C Jupiter s Aurora Outline of Current Lecture I Jupiter s Moons A Io B Europa II Saturn A Saturn s Rings B Titan III Uranus IV Neptune Current Lecture l Jupiter has many moons but the 4 main ones are Io Europa Ganymede and Calisto Ganymede and Calisto are as large as Mercury A Io is filled with craters and volcanoes It lost its water through tidal heating caused by internal stresses produced as its distance from Jupiter changes during its orbit This is the most volcanically active moon in the solar system and it produces a lot of mountains and geysers Like our own Moon Io always shows the same face to Jupiter because it has the same rotation as Jupiter B 25 of Europa s mass could be water This evidence comes from the surface ice flows and the moon s reddish color due to salt deposits It also has numerous surface cracks due to tidal flexing These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute ll Scientists believe there s a hurricane on Saturn s north pole that s hexagon shaped and been there for many years Saturn has visible rings 60 moons and a very low temp It s about 10AU and the mass is 100 times the mass of Earth It has a low density a 10hr day and the tilt of its axis is about 27 degrees It has a rocky core like all other gas giants and at its south pole a storm A Saturn s rings are less than 100m thick but stretch over a hundred thousand km The rings extend to the Roche limit which is when Saturn s tidal forces overwhelm the tendency for particles to conglomerate The F ring is the outermost ring then A ring B ring and C ring is closest to the planet B Titan is Saturn s largest moon and has a substantial atmosphere with 90 nitrogen 10 argon and the rest methane The atmosphere could produce early primitive life forms It s very cold and the methane prevents the atmosphere from freezing lll Uranus is 14 5 times the mass of the Earth 20AU and rotates at about 84 Earth years The outer layers are hydrogen helium and methane which absorbs red light and forms higher clouds giving the planet its blue colors It has about 98 degree tilt and extreme seasons Uranus has 5 moons Miranda is one of them lV Neptune has extreme high speed winds as fast as 2000km h It s 30AU 19hrs per day and extremely cold It also appears blue because of methane in its atmosphere Neptune has a total of 6 moons and Triton is Neptune s largest moon

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