Astronomy

• Satellite


  Anything that orbits a planet
• Types of satellites


  • Natural
  • Artificial
• Natural satellite


  Not man-made
• Artificial satellite


  Man-made, used for communication and other things like orbiting telescopes
• Planets in the solar system

  • Mercury
  • Venus
  • Earth
  • Mars
  • Jupiter
  • Saturn
  • Uranus
  • Neptune
• The planets orbit the sun in a slightly elliptical orbit
• 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 much more elliptical orbits and often travel to the very outskirts of the solar system
• Galaxy


  Massive collection of billions of stars, most of which have their own solar systems
• Our solar system is a super tiny speck about halfway along one of the Milky Way's spiral arms
• Gravity


  Holds all the stars in a galaxy together, they all spin around the middle in the same way that planets orbit the sun
• Universe


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