AST101H1 Lecture Notes - Lecture 8: Molecular Cloud, Orion Nebula, Oort Cloud
3 Oct 2016
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AST101H1 Full Course Notes
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Terrestrial planets = small, rocky, thin/no atmosphere, few/no moons. Mercury no atmosphere, highly craters rocky ext. iron core. Being explored by messenger probe (2nd visit) Venus thick co2 atmosphere, highly volcanic about same size as earth temp of 460c rotates backwards acid rain no moons. Earth one large moon very thin co2 atmophere. Material leftover from formation, also prevented forming due to jupiter"s tides in between mars and jupiter. Mostly gas the rings over 60 moons. Rings are composed of small icy particles. Lecture 8 slushy ice mixture (ice giants) about same size, blue, many moons, faint rings. Trans neptunian objects small ice bodies = dwarf planets (pluto, not the largest) Take a long time to orbit the sun. Kuiper belt ring of comets beyond neptune debris leftover from formation. Oort cloud further, contains millions of comets and is spherical. 50,000 au away planets close to the sun are rocky. / gaseous, icy planets are far from the sun.
