To visualize how far away the Sun is, think about it like this: the Sun is 100 Suns away from us. So if the Sun were a basketball, you could imagine lOO basketballs lined up, and that’s how for away the Sun would be. This distance is known as an AU, or Astronomical Unit. If planes could fly through space, going to the Sun would be an 18—year flight.
We can also use the AU to visualize the size of the Solar System. Mercury, Venus Earth and Mars are 1/3, 2/3, 1 and 1.5 AU from the Sun. Jupiter is 5 AU away while Saturn, Uranus, Neptun and Pluto are conveniently about 10, 20, 30 and 40 AU from the Sun, respectively.
Keishinrei 