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2
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_____ is the most basic property studied in astronomy.
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6
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_____ gives information about how fast or slow an object is moving, and helps astronomers figure out how far away it is.
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8
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The _____ is the fastest velocity that anything can mave in the universe; 300,000 kilometers.
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9
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_____ is the light we can see and consists of the colors red, orange, yellow, green, blue, indigo, and violet.
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10
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An object moving toward us shows lines in its spectrum that are _____, or shifted to the blue end of the spectrum.
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11
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The very largest distances are measured in units of _____, or Gpc.
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1
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Really huge distances are measured in terms of _____, or Mpc for short.
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3
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Astronomy is done in _____.
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4
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The _____ comes from multiplying the speed of light by the total seconds in a year; the result is the distance light travels in a year.
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5
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What do astronomers use to define the distance between Earth and the Sun?
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7
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If the object moves away from us, the lines are _____ - shifted toward the red end of the spectrum.
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8
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Sprectra and spectroscopy take light from an object and slice it up into its component wavelengths, which results in a _____.
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12
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One _____ equals 3.26 light-years.
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