 Which is not true about why Crownwall was able to travel to Vega undetected?
It had been manned by a dozen adventurous people, captained by Crownwall, and had headed out on its ion drive until it was safely clear of the warping influence of planetary masses. They had headed for that planet confidently and unsuspectingly, using the ion drive. Although far within the dangerous influence of a planetary mass, they had again activated the distorter drive, and they had beaten the odds. On the distorter drive, they had returned to Earth as swiftly as they had departed. Even if you could get down to the bottom of the ocean and tamper with the bomb, you would only succeed in setting it off, and that's what the Sunda had been in favor of in the first place.
 He traveled into the future so as to not need to experience the distance travel himself
 He was not technically moving through space in a typical sense  He employed technology unfamiliar to the Vegans  His ship's drive does not give off the usual traceable signals  He traveled into the future so as to not need to experience the distance travel himself