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4
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The name of our galaxy.
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6
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The area where nuclear fusion occurs in the Sun.
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7
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A star's magnitude as seen from Earth.
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8
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Equal to 150,000,000 km
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10
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Gravity pulls rock, ice, and gas together.
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13
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These are the inner planets that have dense, rocky surface.
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16
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Contains the sun, the planets, moons, and other objects that revolve around the star.
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19
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The trapping of heat by the atmosphere
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21
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More than 90% of the stars are found in this location.
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22
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The layer of the Sun that is visible.
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1
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The distance that light travels in one year.
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2
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The first stage of life of all stars.
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3
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Massive planets that do not have a solid surface.
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5
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Thin disk of small particles of ice and rock.
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7
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A star's luminosity if it were at a standard distance from Earth.
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9
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This planet rotates on its side!
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11
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This planet has 95% carbon dioxide in its atmosphere!
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12
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Earth's twin.
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14
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The sudden explosion of a high-mass star.
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15
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A huge group of stars, dust, and gas bound together by gravity.
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17
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The tendency of an object to resist change in motion.
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18
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Closest planet to the sun.
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20
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A large cloud of dust and gas where all stars begin their lives.
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22
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What astronomers use to measure distances to nearby stars.
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