Lecture1.2014_v4.pptx - Astro 18 Planets and Planetary Systems Lecture 1 Overview Planet Jupiter Claire Max April 1 2014

Lecture1.2014_v4.pptx - Astro 18 Planets and Planetary...

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Page 1 Astro 18: Planets and Planetary Systems Lecture 1: Overview Claire Max April 1, 2014 Planet Jupiter
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Page 2 Outline of this lecture Overview of our Solar System and of other planetary systems Five minute break Please remind me to stop at 12:45 pm! Overview of Astro 18 What is the course about? Goals of the course How the course will work
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Page 3 Two main topics for course: Our Solar System Other planetary systems
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Page 4 Total eclipse of the moon the night of April 14 th -15 th (!) We will watch it together
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Page 5 First… Who has seen a planet? What did it look like? Who has looked through a telescope? What did you see?
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Page 6 Our Own Solar System Inhabitants: Sun, planets , asteroids, comets Relative sizes are in correct proportions Relative distances are all wrong here
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Page 7 Sub-categories of planets “Terrestrial” “Giant” “Dwarf Planets”
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Page 8 Status of (poor old) Pluto? In 2007 the International Astronomical Union voted that Pluto and bodies like it were “dwarf planets” Not “real planets” Very contentious! We’ll discuss this in a later lecture It turns out there are many Pluto-like objects in our Solar System
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Page 9 How to remember order of planets? Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune (Pluto?) Mnemonic: a sentence with same first letters of words. Helps remember a list. Examples for the original nine planets: My very eager mother just sent us nine pizzas My very energetic monkey just swung under nine palmtrees Extra credit on mid-term exam: Come up with a new mnemonic for the first eight planets. (Prepare ahead of time). I’ll post them all on web, and we’ll vote on the best. Can start at either closest (Mercury) or farthest (Neptune) from Sun.
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Page 10 More Solar System inhabitants Asteroids Comets Meteorites I’ll bring in my collection view from Galileo spacecraft
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Page 11 Relative sizes of the Planets
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Page 12 Sizes compared with the Sun (!)
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Page 13 Distances in the Solar System take quite a bit of getting used to Mercury Venus Earth Mars
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Page 14 The “Inner Planet” orbits
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Page 15 Scales within the Solar System: The Sun and the Earth Scales within the Solar System: The Sun and the Earth 1. If the Sun were 0.5 meters in diameter, roughly how big would the Earth be? a) baseball b) ping-pong ball c) pea 2. How far from the center of the Sun would the Earth’s orbit be? a) at the back of this classroom b) half a football field away c) at the entrance to campus 1. If the Sun were 0.5 meters in diameter, roughly how big would the Earth be? a) baseball b) ping-pong ball c) pea 2. How far from the center of the Sun would the Earth’s orbit be?
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