 How was Dr. Mansard's radio and ship drive destroyed?
Perhaps she could call one of Motwick's friends; she had no one on Ganymede she could call a real friend herself. It smashed on Kregg's head, splashing the floor with liquor, and Kregg sank stunned to his knees. The gravity of Ganymede was hardly more than that of Earth's moon, but the way the man picked up the limp Motwick with one hand and tossed him over a shoulder was startling: as though he lifted a feather pillow. I was born and brought up there, and I was finally able to build a small rocket with a powerful enough drive to clear the planet.” “If Dr. Mansard succeeded in landing on Jupiter, why didn't anyone ever hear from him again?” she demanded.
 Blessing intentionally ruined it in the hopes that Mansard would die
 Dr. Mansard destroyed it himself to eliminate any record of his survival  It was never destroyed  Blessing intentionally ruined it in the hopes that Mansard would die  It could not withstand the harsh elements of Jupiter's atmosphere