1) Mercury is the closest planet to the Sun. a) True b) False 2) Mars is known as the Red Planet. a) True b) False 3) Jupiter is the smallest planet in the solar system. a) True b) False 4) Venus is the hottest planet in the solar system. a) True b) False 5) The Sun is a planet. a) True b) False 6) Stars are made mostly of gas. a) True b) False 7) A comet is sometimes called a "dirty snowball". a) True b) False

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