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

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