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Edexcel iGCSE Physics 4PH0 Learning Plan Section A6: Astronomy Specification • Recall that the Moon orbits the Earth and that some other planets also have moons. • Understand gravitational field strength, g, and recall that it is different on other planets and on the Moon from that on the Earth. • Explain that gravitational force: • causes the planets to orbit the Sun • causes the Moon and artificial satellites to orbit the Earth • causes comets to orbit the Sun. • Use the relationship between orbital speed, orbital radius and time period: orbital speed = 2 × π × orbital radius / time period v= 2×π×r /T • Describe how the orbit of a comet differs from that of a planet. • Recall that the Solar System is part of the Milky Way galaxy: • describe a galaxy as a large collection of billions of stars • state that the Universe is a large collection of billions of galaxies. Resources Video: none Powerpoint: none Textbook: Page 49 The Solar System DVD Video clip – Ellipses and orbits Page 51 Moons Page 53 Gravitational forces DVD Video clip – Introduction to the Hubble telescope DVD Video clip – How Hubble works Page 54 Orbital speeds of satellites Page 55 The Milky Way DVD Revision check list Assessment Textbook Questions Page 56 Section A6 - Textbook Answers (Chapter 6) pdf DVD Multiple choice test Pages 57 -58 End of Section A Questions. Talking paper video – Edexcel Physics Section A6 Astronomy Section A6 Question – Astronomy –. (pdf) Section A6 Question – mark scheme – Astronomy. (pdf) Videos – www.igcsesciencecourses.com Textbook Ref: Edexcel International GCSE Physics Student Book - Pearson DVD Video Clips – see resource DVD in textbook.