ASTR 151 1st Edition Lecture 28 Outline of Last Lecture I Chapter 12 Review II Chapter 12 5 III Chapter 12 Summary Outline of Current Lecture IV Planet Neptune Uranus V Chapter 13 Section 1 VI Chapter 13 Section 2 Current Lecture I Planet Neptune Uranus biography a Uranus i Discovered by W Herschel 1781 ii Rotates in it s side iii Only Greek named planet in solar system iv Means sky or heaven v 1 of 6 children of the titan Gaia b Neptune i God of fresh water and sea ii Brother of Jupiter and Pluto II Chapter 13 Section 1 Discovery of Uranus and Neptune a Uranus i 1st planet to be discovered in more than 2000 years ii Seen by W Herschel in 1781 also with 3 moons b Neptune i Seen in 1846 after studying Uranus orbit 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 ii Atmosphere is barely visible III Chapter 13 Section 2 Orbital and Physical Properties a Both planets can freeze ammonia b Uranus i Mass 14 5 Earth ii Has a magnetic field iii Moons 27 iv Is 20 astronomical units away from the Sun v 84 3 earth year orbit vi Axial tilt 97 8 degrees 1 Axis rotation lies on the plane of orbit 2 Tilt probably due to multiple impacts when Uranus was forming vii 17 25 hour rotation period viii Gravity 886 ix Flattening 017 x Seasonal variations are extreme xi Has faint rings c Neptune i Moons 14 ii 30 astronomical units iii 164 8 earth year orbit iv Composition Helium Neptunian carbohydrates and other v Band structure is more visible vi Dark spot is similar to Jupiter s storms
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