1) Which planet is the closest to the sun? a) Mars b) Jupiter c) Mercury d) Earth e) Uranus f) Venus 2) Which planet is the hottest? a) Mercury b) Venus c) Saturn d) Neptune e) Mars f) Jupiter 3) How old is the planet earth? a) 4.463 billion years old b) 3.943 billion years old c) 8.452 billion years old d) 5.291 billion years old e) 7.91045 billion years old f) 4.543 billion years old

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