Ordered Binary Tree of Strings
===

Hi Users of Stack Overflow,

These values are entered into an ordered binary tree: Mercury, Venus, Earth, Mars, Jupiter, Saturn and Uranus. 

The resulting binary tree is supposed to be this.

          -> Earth -> Mars -> Jupiter
Mercury 
       
          -> Venus -> Saturn -> Uranus

Is there any reason for this order? Shouldn't Jupiter be under the Venus branch? 

Also sorry for the layout of the tree, not sure how I can display it better. 

Thanks.