Astronomy

• Satellite


  Anything that orbits a planet
• Types of satellites


  • Natural
  • Artificial
• Natural satellite


  Not man-made
• Planets in the solar system

  • Mercury
  • Venus
  • Earth
  • Mars
  • Jupiter
  • Saturn
  • Uranus
  • Neptune
• Orbit of planets


  • Slightly elliptical
• Asteroids


  Mostly made of rock and metal, found mainly in the asteroid belt between Mars and Jupiter
• Comets


  Mostly made of ice and dust, have more elliptical orbits and travel to the outskirts of the solar system
• Galaxy


  Massive collection of billions of stars, most with their own solar systems
• Milky Way galaxy


  The galaxy our solar system is located in
• Gravity


  • Holds stars together in galaxies, causing them to spin around the middle
• Universe


  Vast expanse of mostly empty space scattered with galaxies
• The universe is mostly empty space with unimaginable distances between adjacent galaxies