1) How many years ago was the solar system formed? a) 4.5 billion years ago b) 5 years ago 2) Which planet is the smallest? a) Venus b) Mercury 3) What is the name of the star at the centre of our solar system? a) Sun b) Pluton 4) Is the sun’s temperature greater on the surface or deeper inside? a) Deeper inside b) Surface 5) What is the surface temperature of the sun? a) Surface temperature 100°C b) Surface temperature 5.500°C 6) Which of these drawings is a star? a) b) 7) What is a star? a) A star is an enormous ball of very hot gas b) A star is a little planet that doesn't shine 8) How many planets are there in the solar system? a) 8 b) 20 9) Are there different types of planets? a) Yes b) No 10) Do all of the planets in the solar system orbit the sun? a) Yes b) No 11) Which is the hottest planet? a) Venus b) Saturn 12) What is the name of the earth's satellite? a) The Moon b) The Jupiter 13) What shape does an orbit have? a) Rectangular b) All orbits are elliptical, like an oval. 14) What is the name of the first satellite launched into space by the United States in 1957? a) Sputnik b) Teo 15) Is Mars the third closest planet to the Sun? a) Yes b) No 16) Is Mars positioned between Jupiter and Earth? a) Yes b) No 17) What color is the planet Mars? a) Black b) Red

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