TEST
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Essay
True/false
Multiple choice
Fill in the blank (NO word bank)
Short answer with labeling
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What caused Galileo to accept the theory that the planets revolve around the sun?
What two forces keep the planets in orbit? How do they work together?
PLANETS
 Geocentric: Earth centered
 Heliocentric: sun centered
 Galileo: know that his 2 discoveries lead to the proof of the heliocentric theory (this answer is on the
assessment)
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KNOW the order of the 8 planets
Know characteristics of each planet using the bookwork, the study guide, and the planet video worksheets
Know what 2 forces keep a planet in orbit and what happens if one is missing (this is on the assessment)
Know rotation/revolution
Know the major moons of the planets
COMETS, METEORS, AND ASTEROIDS
 Know the definition and location and movement for each (use the table from the study guide 16-5)
 Know the parts of the comet (be able to draw and label)
 Know the difference between meteor, meteoroid, and meteorite (multiple choice or short answer)
 Use your study guide and bookwork to study
Galileo—
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proved the sun was the center of the solar system (heliocentric)
used a telescope
phases of Venus: proved that Earth can NOT be in center because if it was then we’d
see all of Venus all the time (no phases)
moons of Jupiter: proved not everything revolves around Earth
Solar System-
smaller systems within a system (planets & moons)
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formed from a nebula /sun took 99% of matter
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inner planets are rocky because when sun was forming its heat / energy pushed lighter particles
away but the heavier ones stayed closer  became inner planets
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outer planets are gas because the lighter particles pushed further out  became outer gas giants
Two forces that keep planets balanced in orbit:
 gravity: sun’s gravity pulls planets in
 inertia: planet’s inertia pulls planets in straight line
if one force is missing, then:
 gravity: inertia would pull planet out in straight line
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inertia: gravity would pull planet towards the sun
Comets
meteor
meteorite
meteoroid
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ball of ice & dust with long, stretched
elliptical orbit
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always points away from sun
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solar winds push tail away
pieces of comets & asteroids
asteroids—between Mars and Jupiter
planets— know book work & video notes
DO have to know the moons of planets—only major moons
Revolution & Rotation—
Revolution—moving around another object
365 days is one revolution around the sun = 1 year
Rotation—spinning motion of a planet around its axis
24 hours rotation is one day
Gas giants rotate faster than they revolve