ASTRONOMY 8850: Planetary Sciences Why Sciences?.

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Presentation transcript:

ASTRONOMY 8850: Planetary Sciences Why Sciences?

How to do well in Planetary Sciences 1. show up to class … and be present 2. participate in class 3. get/borrow the book Planetary Sciences by de Pater and Lissauer 4. find course website: 5. find Icarus online (or in the library) 6. choose 3 planetary topic(s) you are most interested in --- start project EARLY 7. do homework --- Solar System Explorers, quizzes, etc. 8. NAIL THE SEMESTER PROJECT

Solar System Explorers 01 Find Icarus online (or in the library). Choose an article relevant to one of your 3 topics. Print out the first page of the article. Turn in single page (with your name on it) at the beginning of class TUESDAY, January 20. Get 5 points in Solar System Explorers.

Solar System Inventory stars planets moons ring systems minor planets Centaurs Trans-Neptunian Objects comets dust a (JPL 2015 JAN 12) 4 (+1?) 670,480 (JPL 2015 JAN 12) 295(JPL 2015 JAN 12) 1,644 (JPL 2015 JAN 12) 3,319 b (JPL 2015 JAN 12) a add 5 for Pluto b any type

Nomenclature terrestrials Mercury, Venus, Earth, Mars many moons jovians gas giants Jupiter, Saturn ice giants Uranus, Neptune minor planets asteroids Main Belt Near-Earth Objects (NEOs) Trojans (and Greeks and Hildas) Trans-Neptunian Objects (TNOs) Plutinos(Classical) Kuiper Belt Objects (KBOs) CentaursScattered Disk Objects (SDOs) comets

Solar Family How are they different?

Jovians and Terrestrials

Planetary Sciences8 Planet Spacing

Planetary Sciences Planet Orbits

The 7 Dwarfs (+ interlopers) X XX

Terrestrial Planet Surface

Planetary Sciences12 Surface Variability

Jovian Planet “Surface”

Planetary Sciences …we can land/work on surfaces

Planet Characteristics location spacing mass size density composition surface albedo rotation magnetics moons rings AU AU close wide Earths Earths Earth radii Earth radii g/cm g/cm 3 rocky gaseous/icy solid any? slow fast none/weak strong (integrated) none/few many none all Characteristic Terrestrial Jovian

obliquities (tilts)

Planetary Sciences17 bizarre bar magnets

magnetospheres Earth’s is strongest terrestrial surface mag field = 0.3 G mag moment = 8x10 25 G/cm 3 enough to protect us from charged particles Mercury’s, Ganymede’s wimpy Venus?, Io, Europa, Callisto induced Mars’ patchy crustal Jupiter’s is strongest jovian surface mag field = 4.3 G mag moment = 20000X Earths Io plasma torus complicates affects all Galilean satellites Sat/Ura/Nep surface mag fields similar strength to Earth’s

Planetary Sciences Jupiter’s magnetotail

trends in the Solar System size with distance from the Sun composition with distance spacing of planets with distance # moons with planet mass magnetic fields with mass rotation speeds with mass non-trends in the Solar System surface gravities not radically different obliquities do not behave 7 large moons are worlds of their own: Moon, Io, Europa, Ganymede, Callisto, Titan, Triton

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