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2
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________ surrounds all the gas giant planets.
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5
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This scientist worked out arrangements of the planets and sun.
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6
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The system that was invented by the early Greek astronomers.
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7
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A device used to observe distant objects.
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9
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________ is the largest gas planet.
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10
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The shape in which planets orbit around the sun.
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1
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This planet is four times the diameter of Earth.
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3
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The number of planets.
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4
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Mercury is the smallest _______ planet.
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8
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________ is theonly planet in the solar system that can support life.
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