Did you know?/Quiz 1. What the name of the astronomer who constructed an astronomical telescope? Answer  2. Who wrote the Principia? Answer 3. Which planets is the closest to the Earth? Answer 4. Which of the nine planets has the longest revolution period? Answer 5. On which planets would you look for the Great Red Spot? Answer 6. What is the first name of the person who created Kepler’s law? Answer 7. Is Ptolemaic system heliocentric or geocentric? Answer 8. Who first suggested that the Sun was at the centre of the solar system, with Earth and other planets orbiting around it? Answer