question:  Which is not true about why Crownwall was able to travel to Vega undetected?
context: The sight of an Earthman on Vega III, where it was impossible for an outlander to be, brought angry crowds to surround John Crownwall as he strode toward the palace of Viceroy Tronn Ffallk, ruler of Sector XII of the Universal Holy Empire of Sunda. "It was only decided yesterday, back on Earth, that I would be the one to make the trip here. What I meant was that I expected someone from Earth to break through our blockade and come here. "If you wanted someone from Earth to come here to see you, why did you put the cordon around Earth? And why did you drop a planet-buster in the Pacific Ocean, and tell us that it was triggered to go off if we tried to use the distorter drive? There was even serious discussion of destroying Earth out of hand, while it is still possible. 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. In less than a week's time, if time has any meaning under such circumstances, they had flickered back into normal space, in the vicinity of Alpha Centauri. They had headed for that planet confidently and unsuspectingly, using the ion drive. Two weeks later, while they were still several planetary diameters from their destination, they had been shocked to find more than two score alien ships of space closing in on them—ships that were swifter and more maneuverable than their own. These ships had rapidly and competently englobed the Star Seeker , and had then tried to herd it away from the planet it had been heading toward. 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.
output:  He traveled into the future so as to not need to experience the distance travel himself
options:  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