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20 Cards in this Set
- Front
- Back
What is a solar system?
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a sun and all the objects that move around it
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What is a galaxy?
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a group of millions of stars
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What is an orbit?
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the path that one object in space takes around another object in space
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What is an asteroid?
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a large space rock that orbits the sun
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What is a meteoroid?
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a small space rock that orbits the sun
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What is a comet?
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a mountain-sized chunk of ice and dust that orbits the sun
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What is a solar eclipse?
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the moon casting a shadow on Earth
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What is atmosphere?
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the air that surrounds Earth
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If the sun were hollow, how many Earths could it hold?
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1.3 million
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All life on earth, weather, and our climate depend on what?
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The Sun
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What is a moon?
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a natural object that orbits a planet
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What is the Milky Way?
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the galaxy that our
Solar System is part of |
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What feature of the Earth causes us to have seasons?
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The Earth is tilted a little to one side.
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What is a manned journey into space?
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a journey that includes human beings
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What is an unmanned journey into space?
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a journey that includes no humans, but only scientific equipment to collect data
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What are the main gases in Earth's atmosphere?
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nitrogen and oxygen
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If Earth's gravity equals 1, what is Mars' gravity?
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0.38
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About how many days does it take Earth to revolve around the sun?
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365
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How far from the Sun is Earth?
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93 million miles
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How many rings does Neptune have?
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Four
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