1) What is the star at the center of our solar system? a) Moon b) Sun c) Mercury d) Jupiter 2) How many planets are there in the solar system? a) 7 b) 8 c) 9 d) 10 3) Which planet is closest to the Sun? a) Mars b) Venus c) Mercury d) Earth 4) Which planet is known as the Red Planet? a) Neptune b) Mars c) Jupiter d) Saturn 5) What is Earth’s natural satellite? a) Io b) Titan c) Moon d) Phobos

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