1) Which planet is closest to the Sun? a) a) Earth   b) b) Venus c) c) Mercury 2) Which planet is known as the "Red Planet? a) Jupiter b) Mercury c) Mars 3) What is the Sun? a) A star b) A planet c) A moon 4) How many planets are there in the Solar System? a) 10 b) 9 c) 8 5) What is an object that orbits around a celestial body?  a) A planet   b) A satellite   c) A star  

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