Astronomy Test - Ch. 4 : A Family of Planets
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| What does "planet" mean? | wanderer
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| Where does the name terrestrial planets get it's name? | because inner planets resemble Earth and have solid/rocky surfaces
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| Moon rocks lead us to believe our solar system is about how many years old? | 4.6 billion years
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| How do scientists measure distance in space? | speed of light
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| What is the best unit for measuring solar system distances? | astronomical unit
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| vocab: meteors | rocky bodies that burn up in the sky
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| Who used a telescope to explore the night sky in the 17th century? | Galileo
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| How do gas giants differ from terrestrial planets? | gas giant's atmospheres are made of a very thick gas layer
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| Why don't eclipses happen monthly? | the orbit of the moon is tilted
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| How are meteoroids and asteroids different? | asteroids are larger than meteoroids
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| vocab: phases | change in the appearance of the moon
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| What evidence do we have supporting the current theory of the moon's origin? | moon rocks are similar to rocks in the Earth's mantle
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| Know the 8 phases of the moon and know how to label them. | new moon, full moon, first quarter, third quarter, waning gibbous, waxing gibbous, waning crescent, waxing crescent
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| What type of body will likely have many craters? | one with no atmosphere
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| How does atmosphere affect asteroid impact craters? | atmosphere burns up small objects and rain/erosion remove craters
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| vocab: meteorite | a meteoroid after it strikes the surface of Earth
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| Do we always see the same side of the moon? | yes, because its period of rotation is the same as its period of revolution
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| Why do we study comets and asteroids? | help us understand our solar system's history
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| vocab: terrestrial | inner planets of our solar system
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| What system is used to rate the hazard of an object moving towards Earth? | Torino scale
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| vocab: comets | dirty snowballs made of ice, rocks, & dust
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| What is a total solar eclipse? | the moon completely covers the sun
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| vocab: revolves | the time it takes for the moon to circle the Earth
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| How did the moon originate? | a large body struck Earth and blasted part of the mantle into space
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| vocab: rotates | what the moon does on its axis
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| Why does the moon have phases? | the position of the moon, sun, and Earth
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| vocab: satellites | an smaller object that orbits a larger object
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| Mercury | planet year is 88 Earth days long
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| Neptune | planet with the Great Dark Spot
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| Saturn | planet with a spectacular ring system
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| Earth | planet that contains life
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| Pluto | smallest planet in our solar system
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| Venus | planet that spins with a retrograde rotation
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| Know the order of the planets | Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto
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| Where are the comets of the Oort Cloud found? | after Pluto
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| Where is the asteroid belt located? | between Mars and Jupiter
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