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6 Space physics 6.1 Earth and the Solar System 6.1.1 The Earth 1 2 Know that: (a) the Earth is a planet that orbits the Sun once in approximately 365 days (b) the orbit of the Earth around the Sun is an ellipse which is approximately circular (c) the Earth rotates on its axis, which is tilted, once in approximately 24 hours (d) it takes approximately one month for the Moon to orbit the Earth (e) it takes approximately 500 s for light from the Sun to reach the Earth Define average orbital speed from the equation v = 2π r T where r is the average radius of the orbit and T is the orbital period; recall and use this equation 6.1.2 The Solar System 1 2 3 Describe the Solar System as containing: (a) one star, the Sun (b) the eight named planets and know their order from the Sun (c) minor planets that orbit the Sun, including dwarf planets such as Pluto and asteroids in the
