A planet has a volume of $\displaystyle {6.7}\cdot{10}^{{14}}$ km³. One of its moons has a volume of $\displaystyle {6.8}\cdot{10}^{{10}}$ km³. Which of the following most closely approximates how many orders of magnitude more volume the planet has?
NASA: Cassini spacecraft wide-angle camera on 22 May 2015