ch 27 review planets & the solar system. name the inner planets
TRANSCRIPT
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Ch 27 Review
Planets & the Solar System
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• Name the inner planets
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• Mercury• Venus• Earth• Mars
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• What lies between the inner and outer planets?
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• Asteroid belt
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• Where is the largest volcano in the solar system located?
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• Mars
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• What is another name for the inner planets (as a group)?
• Why are they called that?
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• Terrestrial planets• b/c they are Earth-like
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• What are the characteristics of the outer planets?
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• Considerably larger than Earth• gaseous, outer layer is mostly hydrogen gas– closer to center hydrogen is compressed into a hot
liquid• Much less dense than Earth• All have ring systems
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• Why isn’t Pluto considered a planet anymore?
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• Oddity of the solar system– Not dense enough to be considered “terrestrial”– Too small to be “Jovian”– Strange orbit
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• What is the orbital period of Mars?
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• 88 Earth days
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• The largest moon in the solar system is _________.
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• Ganymede (around Jupiter)
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• What is the relationship between the distance of a planet from the sun and its orbital period? Why?
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• The closer the planet is to the sun, the shorter its orbital period. As you go further away, the planet has a longer distance to travel and the sun’s gravity pulls on it less.
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• Why does Mercury have so many craters?
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• It lacks an atmosphere
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• What is unique about Venus’ rotation?
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• rotates from east to west (clockwise)
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• How long is Venus’ period of rotation?
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• 243 Earth days
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• On which planet is a day longer than a year?
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• Venus
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• Which planets radiate more energy into space than they receive? Why?
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• Jupiter and Saturn b/c they have sources of internal heat
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• Name all of the planets that have rings.
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• Jupiter, Saturn, Uranus, Neptune
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• What does Pluto’s atmosphere seem to do when it is as perihelion?
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• Thaw slightly.
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• Which planet has seasons like Earth?
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• Mars
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• The Galielean moons, Io, Europa, Ganymede, & Callisto orbit _____________.
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• Jupiter
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• What are the characteristics of terrestrial planets?
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•Rocky crusts•dense mantle layers• very dense cores
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• What do we now consider Pluto?
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• Dwarf planet
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• What is the difference between a meteoroid, meteor, & meteorite?
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• Meteoroid = in space• Meteor= moving through Earth’s atmosphere
(“shooting star”)• Meteorite= meteor that has reached Earth’s
surface
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• Why does Mars have seasons?
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• It’s tilted on it’s axis (like Earth)
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• What is the difference between an asteroid and a meteor?
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• Asteroids are bigger
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• How long are seasons on Mars compared to on Earth? Why?
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• Twice as long b/c a year is twice as long
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• How was Neptune discovered?
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• Using mathematics
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• What is a satellite?
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• an object that orbits a planet
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• What are the parts of a comet?
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• Nucleus• Coma & tail (only when “near” the sun)
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• What are the two “planetary” neighborhoods that we can divide the planets into?
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• Inner planets• Outer planets
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• Phobos & Deimos are the moons that orbit ___________.
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• Mars
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• Why is Venus’ temperature so high?
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• It has a dense atmosphere that is mostly carbon dioxide (CO2) “runaway” greenhouse effect
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• How often can we see Haley’s comet?
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• Every 76 years
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• _________ is one of Saturn’s moon, and is the second largest moon in the solar system.
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• Titan
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• What is another name for the outer planets (as a group)?
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• Jovian planets, Jupiter-like planets, gas giants
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• What is so interesting/unique about Titan?
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• Only moon known to have a substantial atmosphere
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• Comets spend most of their time _____________________.
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• Beyond Neptune’s orbit
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• Triton is one of _________’s moons.
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• Neptune
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• What does solar wind do to a comet’s tail?
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solar wind pushes coma far out into space, forming dramatic tails… generally point away from the sun
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• What shape are asteroids? What does this cause as they rotate?
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• Irregular, causes them to appear to be changing in brightness as they rotate
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• What is the density of Saturn? Why is this special?
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• 0.7 g/cm3 … it could float on water
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• Asteroids revolve around _____________.
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• The sun
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• Meteor showers are named for ___________.
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• the constellation from which they appear to originate (ex. Perseids, happen in Aug., appear to come from constellation Perseus)
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• What is the mass of Neptune (if Earth’s mass = 1)?
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• 17.151 (Earths)
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• What are the 3 basic types of meteorites?
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• Stony– ~94%
• Iron– ~5%
• Stony-iron– ~1%
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• Bowl-shaped depressions that remain after meteor or other object hits Earth, other planet, moon are called _____________.
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• Impact craters
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• What is Pluto’s mean distance from the sun?
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• 5,900 million kilometers
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• Titania, Oberon, Umbriel, Ariel, & Miranda are the 5 major moons of _____________.
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• Uranus
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• Name the outer planets
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• Jupiter• Saturn• Uranus• Neptune
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• What is the equatorial diameter of Jupiter?
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• 142,800 km
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• Why might some planets lack craters or have few craters?
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• Have an atmosphere, are geologically active (“erases” craters)
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• How many moons does Venus have?
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• 0