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28 Cards in this Set
- Front
- Back
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What is the geocentric theory?
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that the earth is the center of the Solar System
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Who proposed the geocentric theory?
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Ptolemy
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What was in Ptolemy's solar system?
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Mercury, Mars, Venus. Jupiter, Sarurn, Earth, moon, sun, sphere of stars
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What is the helicentric theory?
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sun is the center of the solar system, moon revolve arund the earth and the earth around the sun, movement of the sun and stars is caused by the Earth's rotation
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who proposed the heliocentric theory?
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copernicus
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What are the inner planets?
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Mercury, Venus, Earth, Mars
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What is special about the inner planets?
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closest to sun, rocky solid surfaces,like the earth (terrestrial)
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What are the outer planets?
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Jupiter, Saturn, Uranus, Neptune, PLuto
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What are the gas giants?
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Jupiter, Saturn, Uranus, Neptune
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What are the gas giants made of?
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swrling balls of gas, surfaces are slush from frozen gasses
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what is pluto classified under?
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not classified, appears to made of gasses frozen into ice
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hwo did the solar system form
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there was a nebulae (swirling cloud of ice and dust) gravity contracted %99 of the material into a tightly packed compact spinning disk, center was so hot because the gasses were put under pressure so nuclear fusion began and the sun was born, rest of the material clumped and the rest of the solar system was formed (because of solar wind)
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Why are the inner planets closer and the outer planets farther away?
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inner planets are heavy so it is harder to push them away and the outer are made of light gases so they were easy to push
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What are the two forces that keep the planets in orbit?
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inertia and gravity
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how do gravity and inertia work together
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gravity keeps the planets in orbit and inertia keeps planets from being drawn into the sun
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what is kepler's law of planetary motion
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elliptical orbits, sun is not centered in the orbit, closer planets travel faster around the sun than farther planets
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Which planets travel faster around the sun, the inner or outer
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the inner
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What is an asteroid?
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a chunk of rock not big enough to be a planet, found in asteroid belt between mars and jupiter, irregular haped, largest is Ceres
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What is a comet?
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a mass of rock and dust mixed with frozen wter, methane, and ammonia, two parts are tail and head
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What are the two parts of the head??
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nucleus- center of comet -coma-gas cloud around the comet
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What is the tail of a comet?
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gasses trailing behind the comet, formed by solar wind, points away from sun
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zwhat is the difference between meteors, meteorites, and meteoroids
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meteoroids are chunks of rock in space
meteors are meteoroids in the earth meteorites are meteorids that don't burn and hits a planet |
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what is the order of the planets from biggest to smallest
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jupiter, sturn, uranus, neptune,. earth, vennus, mars, mercury, pluto
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why os the sky in Mercury black?
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no atmoshere so no light can shatter whick mamkes our sky blue
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why is venus the hottest planet
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the carbon dioxide traps the heat in and doesn't let it out (greenohouse)
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What planets have 0 moons
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mercury.venus
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what planets have 1 moon
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pluto, earth
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who has the most moons
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jupiter (61)
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