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Lesson 2 Test Review
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Why are planets round (spherical)?
The gravity pulls the mass towards the center of the mass
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What force pulled most of the matter to the center of the newly forming solar system?
gravity
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Which model of the universe placed the sun in the middle of the solar system?
Heliocentric Model
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WHICH ONE? Larger objects with MORE MASS have...MORE or LESS gravity?
MORE!
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Is it possible for a planet to have more than one moon?
yes!
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Name the four inner planets, from the sun outward:
Mercury, Venus, Earth, Mars
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Which can be bigger, an asteroid or a meteor?
Asteroid
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These are known as "shooting stars" as they streak across the sky in our atmosphere.
Meteors
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When a meteor travels through the earth's atmosphere and reaches the earth's surface, it's called...
a meteorite
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True or False: Pluto is the largest Dwarf planet.
False...(Eris is slightly larger)
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Why are the four outer planets called "The Gas Giants?"
They are made primarily of gas.
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What do the four outer planets have in common?
They are all gaseous.
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What is evidence on the surface of a planet that it has been hit by meteors?
craters
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Why is Venus the hottest?
the thick atmosphere traps the heat like a blanket.
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Which famous astronomer discovered the four largest moons of Jupiter?
Galileo Galilee
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True or False: Pluto is larger than the earth's moon.
False, it's smaller than our moon.
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Why do the sun and the moon appear to be the same size?
The moon is so much closer to earth than the sun
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What do the four inner planets all have in common?
They all have rocky, solid surfaces.
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What are the TWO FORCES that keep a planet orbiting a star?
Gravity and Inertia
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Which planet is the hottest?
Venus
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What celestial body is formed from a swirling cloud of dust and gas?
a star
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Why is the Kuiper Belt so cold?
It's so far away from the sun.
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This space object is known as a "dirty snowball."
comet
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Which planet is the largest?
Jupiter
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What celestial body was at the center of the geocentric model of the solar system?
the earth
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Which planet is the smallest?
Mercury
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What is the space object, made of rock or ice & rock, that orbits a planet?
a moon
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True or False: The moon is thought to be much younger than the earth.
False...they are about the same age.
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True or False: Ancient astronomers thought the earth did not rotate.
TRUE
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Why is it so difficult to have a scale model of the solar system?
It's too big! There is so much empty space between the planets.
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What space object is made of rock and ice and originates in the Kuiper Belt?
Comet
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Between which two planets is the Asteroid Belt?
Mars and Jupiter
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What celestial body was at the center of the heliocentric model of the solar system?
the sun
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Name the four outer planets, from the sun outward:
Jupiter, Saturn, Uranus, Neptune
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Which planet may have frozen water beneath its polar surface, and might support life?
Mars
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Which can be bigger, an asteroid or a meteor?
Asteroid
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Why does a comet have a tail?
The frozen surface vaporizes into a gas.
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Is it possible for a dwarf planet to have its own moon?
yes
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Why do we see meteors in the night sky?
We see them burning up in our atmosphere.
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What is the force that pulls bodies of mass towards each other?
gravity
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When a smaller space object is "captured" by a planet, and it then orbits the planet, it becomes the planet's ____
moon.
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What is the collection of asteriods located between Mars and Jupiter called?
Asteroid Belt
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Which model of the solar system placed the earth in the middle, and incorrectly stated that earth does not rotate?
Geocentric
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What is unusual about a comet's orbit around the sun?
It's extremely long and can take over 200 years (and it's elliptical)
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What is a small, irregularly-shaped space object that is usually found between Mars and Jupiter?
Asteroid
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Is it true that dwarf planets share their orbital path with other celestial objects?
yes
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