1) The sun is a ... times as big as the Earth. a) million b) thousand c) hundred 2) There are only ... planets in our solar system. a) seven b) eight c) nine 3) Two of these eight planets, ... and Mercury don't have any moons. a) Mars b) Venus c) Jupiter 4) Ancient astronomers believed that ... was the centre of the universe. a) the Earth b) the Sun c) the Moon 5) The Karman Line is one hundred ... meters above the Earth. a) million b) thousand c) billion

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