1) How many planets are there in our solar system? a) six b) four c) seven d) eight 2) Is the sun a planet? a) Yes, it is. b) No, it isn't. It's a star. 3) Which is the smallest planet? a) Saturn b) Mercury c) Neptune d) Uranus 4) Is Venus hotter than Mercury? a) Yes, it is. b) No, it isn't. 5) Which are the coldest planets? a) Mercury, Jupiter, Venus b) Saturn, Uranus, Neptune c) Mars, Earth, Saturn d) Sun, Neptune, Neptune 6) Which is the biggest planet? a) Uranus b) Neptune c) Jupiter d) Saturn

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