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10 Cards in this Set
- Front
- Back
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Universe
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everything in space
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Astronomer
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a scientist who studies the universe.
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Refracting Telescope
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a telescope that gathers light with a lens.
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Reflecting Telescope
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a telescope that uses a mirror to gather light.
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Observatory
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a place where astronomers study the sky.
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Space Probe
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an unmanned craft sent out into space; space probes do not orbit planets.
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Astronomical Unit
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the average distance from the Earth to the Sun. = 93,000,000 miles.
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Light Year
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the distance light travels in one year.
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Constellation
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a group of stars named for an object, person, or animal.
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Galaxy
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a group of stars, dust, and gases held together by gravity.
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