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Lecture 13

Astronomy Lecture 13.docx

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Patrick Mc Graw

Astronomy Lecture 13 Uranus - Distance from sun – 19AU - Size 4 x earth - Mass 15 x earth - Composition – hydrogen, helium, and methane atmospheres slushy interior (rocks, water, methane); heavy element core - 27 moons and ring system - Axis of rotation is tilted at 98 degrees Neptune - Distance from sun – 30AU - almost same as Uranus Terrestrial Jovian Mass - Composition, density - rocks, metals Hydrogen, Helium, slushy interior Moons – earth 1 moon, mars 2 moons, Jupiter 67. Jovian has more moons Rings – No Yes Pluto - size – 0.19 x earth - distance – 39 AU - moons – 5 - rocky/icy surface Space Debris - The total mass of all the other objects is less than that of the earths moon - Includes – asteroids (500,000) known - Comets estimated 10^8 to 10^12 Asteriods - Found throughout solar system but mostly between mars and Jupiter - Average separation in asteroid belt is 1.3 million km - Rocky/metallic composition Comets are dirty snowballs - Icy nucleus 10s of km across - Composition rock +ices - Ices: water ice, dry ice, carbon monoxide, methane, ammonia - If its orbit carries it toward the sun, the warmth will cause gas and dusty to be released from the nucleus - Comet tails can stretch 10^8 km, always point away from the sun. Comets can come from 2 places - Short period comets
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