A newly discovered rocky exomoon has a mass of 3.0 × 1023 kg and an escape velocity of 5.2 km s-1. What is the order of magnitude of the radius of this exomoon?
105 m10^5\text{ m}105 m
106 m10^6\text{ m}106 m
107 m10^7\text{ m}107 m
108 m10^8\text{ m}108 m
