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1 of 9 © Boardworks Ltd 2015 Introducing the Solar System The Solar System is made up of various celestial objects: the Sun the planets moons asteroids comets. How do these objects interact? The Sun is a star – a massive ball of hot glowing gas. It has the strongest gravitational field in the Solar System. All the other celestial bodies orbit around it. 2 of 9 © Boardworks Ltd 2015 Labelling the planets 3 of 9 © Boardworks Ltd 2015 Is Pluto a planet? In 2006, the International Astronomical Union defined a planet as: “a celestial object that orbits the Sun, has enough mass to be spherical, and has cleared the area around its orbit of objects.” This photograph shows Pluto and its moon, Charon. Pluto’s orbit is surrounded by smaller objects that have not been cleared by its gravitational field. Pluto and the other ‘smaller’ planet-like objects such as Eris and Ceres have now been reclassified as Dwarf Planets. 4 of 9 © Boardworks Ltd 2015 Relative size of the Universe 5 of 9 © Boardworks Ltd 2015 What is a light year? The distances between stars, and even between objects in our solar system, are huge. It is cumbersome to use m or km. Distance: To Sun To nearest star (Proxima Centauri) Diameter of Milky Way To Andromeda galaxy km light years light 1.50 × 108 8.3 minutes 4.0 × 1013 4.2 9.5 × 1017 100,000 2.4 × 1019 2,500,000 Alternative measurements for distance are used instead: the most common is the light year. 1 light year is the distance that light travels in one year. 6 of 9 © Boardworks Ltd 2015 Data on the Solar System 7 of 9 © Boardworks Ltd 2015 Solar System quiz 8 of 9 © Boardworks Ltd 2015 Want to see more? This is only a sample of one of thousands of Boardworks Science presentations. To see more of what Boardworks can offer, why not order a full presentation, completely free? Head to: www.boardworks.co.uk/sciencepresentation 9 of 9 © Boardworks Ltd 2015