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Orbits of Planets and Moons Orbits Universal Law of Gravitation 9J Gravity and space Orbits 9J Gravity and space Orbits 1. All of the planets in our solar system revolve around the sun. 2. The moon revolves around the Earth. 3. Two forces keep the planets in orbit: a. Inertia – Keeps the planet in a path moving away from the sun b. Gravity keeps the planet moving towards the sun. c. A balance of these 2 forces keep the planet moving towards the sun. 9J Keeping your feet on the ground Wherever you are on Earth, the same force keeps your feet on the ground. It holds our atmosphere around us and keeps the oceans on the Earth. What is it? You remember – it’s... 9J Keeping your feet on the ground Universal Law of Gravitation All Objects in the universe are attracted to all other objects 1. The size of the planet and its speed determines the size of the planet’s orbit. 2. Planets closer to the sun have smaller, faster orbital paths. 3. Planets farther away from the sun have longer, slower orbital paths. 9J Working outwards from the Sun Label the planets in order, starting with Mercury nearest the Sun. Earth Mercury Jupiter Saturn Neptune Uranus Mars Sun Venus Distances not to scale 9J Satellite links So theWhat’s Moon is a a satellite of the Earth. satellite? There are also pieces of broken Anything spaceship and other debris in that’s in orbit orbit, that have been trapped by around aput artificial Scientists the Earth’s gravitational field. larger body. satellites in orbit round the Earth too. 9J Quiz How much do you know about our Universe? 1. The Moon orbits the Earth in… a) a circle b) an ellipse c) a spaceship. Correct Answer: B 2. Jupiter’s gravitational pull is… a) larger than Earth’s b) smaller than Earth’s c) the same as Earth’s. Correct Answer: A (It is about 2.5 times that of Earth’s Gravity) 9J Quiz 3. The Sun is at the centre of the… a) Earth b) Universe c) Solar System Correct Answer: C 4. The stars and planets stay in their places because of… a) glue b) gravity c) speed. Correct Answer: B 9J Space words Match each word to its correct meaning. gravity solar orbit lunar ellipse satellite word meaning orbit the path a satellite takes around a body ellipse a ‘flattened circle’ shape gravity force that pulls two bodies towards each other satellite Anything in orbit around a larger body lunar to do with the Moon solar to do with the Sun 9J Let’s stay together Why do planets orbit the Sun? It’s the result of gravity. What will happen if you switch the gravity off? Explain how gravity keeps the planet orbiting the Sun.