Question

One Astronomical Unit is the average distance between .......... and ...........?

Answer 1

1 astronomical unit is the average distance between sun and earth = 1. 49 x 10^11 m

Answer 2

One Astronomical Unit is the average distance between Earth and Sun.
The Sun is 149.6 million Km.Away. 
1 astronomical unit  = 149597870700 metres (exactly)
                                =  92.955807 million miles
                                =  499.004 light-seconds
                                = 4.8481368 millionths of a parsec
                                = 15.812507 millionths of a light-year. Answer.............