• Created by: Lucy S
  • Created on: 05-04-13 13:20
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  • Astronomy
    • The Solar System
      • Some planets  have moons, which orbit their planets.
      • The solar system consists of planets orbiting the Sun.
      • Planets & moons are visible because they reflect light from the Sun.
      • The Sun is a star, producing vast amounts of energy.
      • Dwarf planets, asteroids & comets also orbit the Sun.
    • Comets
      • Comets orbit the Sun.
      • They have a body of dust & ice.
      • They have a highly elongated orbit.
        • Their paths come close to the Sun for part of the path & then travel a long way away from the Sun.
      • They have a 'tail' of melting ice & debris pointing away from the Sun.
      • They are most visible & travel quickest when close to the Sun.
    • Galaxies
      • The universe is a large collection of billions of galaxies.
      • A galaxy is a large collection of billions of stars.
      • Our galaxy is called the Milky Way.
    • Gravitational Forces
      • Gravity keeps the moons in orbit of their planets.
      • Gravity keeps the planets in orbit around the Sun.
        • Planets orbit the Sun in ellipses.
      • Gravity keeps the Solar System in orbit around the centre of the Milky Way.
    • The Strength of Gravity
      • Gravity is the force that attracts objects with mass to each other.
      • The strength of gravity is measured with Gravitational field strength (g).
      • Gravitational field strength varies from planet to planet, moon to moon.
        • On Earth, g=10N/kg.
    • Orbital Speed
      • V = 2(pi)r / T
      • Orbital speed = 2 x (pi) x orbital radius / time period.
        • V = 2(pi)r / T
      • Planets move more quickly when they are closer to the Sun.




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