solarsystemintroform

# - Exam 1 test results Clicker Question C D Grades posted online in mastering astronomy F B A According to Newton's Law of Gravity if the distance

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1 Exam 1 test results Grades posted online in mastering astronomy A B C D F Clicker Question: According to Newton's Law of Gravity, if the distance between two masses is doubled, the gravitational force between them is A: half as strong B: twice as strong C: one fourth as strong D: four times as strong Clicker Question: One arcsecond is equal to A: 1/3600 degrees B: 1/60 degrees C: 60 arcminutes D: 60 degrees Clicker Question: If the temperature of the Sun suddenly doubled from 6000 to 12000 K, but the size stayed the same, the luminosity would: A: decrease by a factor of 4 B: increase by a factor of 2 C: increase by a factor of 4 D: increase by a factor of 16 The Solar System Ingredients? The Sun Planets Dust Moons and Rings Comets Asteroids (size > 100 m) Meteoroids (size < 100 m) Kuiper Belt Oort Cloud A lot of nearly empty space Zodiacal Dust Looking outwards (away from the sun) Looking inwards (in infrared)

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2 Zodiacal dust Dust particles on the plane of the orbits of the planets. (size: 1 to 300 x 10 -6 m) Solar System Perspective Orbits of Planets All orbit in same direction . Most orbit in same plane. Elliptical orbits, but low eccentricity for most, so nearly circular . Exceptions: Mercury Pluto (no longer a planet) orbital tilt 7 o orbital tilt 17.2 o eccentricity 0.21 eccentricity 0.25 Sun, Planets,our Moon and Pluto to scale (mostly) Mistakes: Jupiter should have rings Pluto should be smaller than Moon Figure 4.3 (untrimmed) DEMO: Bag of Planets
3 Two Kinds of “Classical” Planets "Terrestrial" Mercury, Venus, Earth, Mars "Jovian" Jupiter, Saturn, Uranus, Neptune Close to the Sun Small Far from the Sun Large Few Moons No Rings Main Elements Fe, Si, C, O, N Mostly Rocky High Density (3.3 -5.3 g/cm 3 ) Slow Rotation (1 - 243 days) Mostly Gaseous Low Density (0.7 -1.6 g/cm 3 ) Many Moons Rings Main Elements H, He Fast Rotation (0.41 - 0.72 days)

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## This document was uploaded on 12/13/2011.

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- Exam 1 test results Clicker Question C D Grades posted online in mastering astronomy F B A According to Newton's Law of Gravity if the distance

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