 What is likely the reason that Dr. Vincenti left Earth?
But with the Procyon shuttle arriving yesterday, there was no telling what might turn up. For eighty years now, they’d been sending out the little ships that vanished at greater than the speed of light, equipped with every conceivable device to make them return automatically after taking pictures of wherever they arrived. The discovery that men could live practically forever had put an end to most family ties; sentiment wore thin in half a century—which wasn’t much time now, though it had once seemed long enough. It took two accidents to get the thing back to us—and with a half-light-year miss that delayed it about twenty years before the Procyon shuttle heard its signal.
 he discovered the truth about rejuvenation
 he missed his family and wanted to live with them  he wanted to share his newest discovery with a different planet  there wasn't a lot of demand for doctors on Earth  he discovered the truth about rejuvenation