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    Solar System: Planets Quiz
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____ is the smallest planet and the closest to the Sun. Mercury
____ has an atmosphere of 78% nitrogen and 21% oxygen. Venus
____ has a very dense, mostly carbon dioxide atmosphere. Earth
____ is the largest planet. Ganymede is its largest moon. Mars
____ appears red due to the iron oxide dust on its surface. Jupiter
____ has spectacular rings. Titan is its largest moon. Saturn
____ appears vivid bright blue. Triton is its largest moon. Uranus
____ was the first planet discovered using a telescope (1781). Neptune

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