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Grade 9 Academic Science – Unit 3 Space The Solar System: The Sun and the Planets Section 8.3 Pages 313-317 In orbit around the Sun, there are ________ planets and their __________, and billions of other smaller celestial objects. Name the planets from closest to farthest from the Sun. An _____________________ (AU) is the average distance between the Sun and the Earth. 1AU = 150 million km. Convert the following (create a ratio) 0.39 AU = _______ km (distance from Mercury to Sun) ________ AU = 9.0 X 109 km (distance from former planet Pluto to the Sun) Little Planets Big Planets Names Rocky or Terrestrial High/Low Mass Rotational Period (day) Orbital Period (year) To be classified as a planet, the following criteria must be met. 1. 2. 3. A _______________ orbits the sun and have a spherical shape, but do not dominate their orbit. Smaller members of the solar system Asteroids Meteoroids Comets Questions – Homework Page 317, Questions 1-9 Section 8.4 Pages 318-319 Scale Model of the Solar System Complete the scale model in Section 8.4 Answer the questions under the headings “Analyze and Evaluate” and “Apply and Extend”