• World Space Day
     Help
  • What is a light-year?
    The distance light travels in one year
  • Why do planets stay in orbit around the Sun?
    Sun's gravity
  • What’s the difference between rotation and revolution?
    Rotation is spinning on an axis while revolution is orbiting the sun
  • Unlock this slideshow and over 4 million more with Baamboozle+
    Try slideshows
    • Your experience on this site will be improved by allowing cookies.