 What could the moral of the story be?
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. Pre-setting a course may take centuries, if we can ever master it. Heroism had belonged to those who knew their days were numbered, anyhow. Dubbins was at his side almost at once, with a hand under his arm to guide him toward his suite. After all, there was nothing to worry about; Earth’s doctors could cure anything.
 Mortality is crucial to enjoy life to the fullest.
 People will make sacrifices like the one Giles made at the end for the greater good.  Mortality is crucial to enjoy life to the fullest.  Given the chance, humans will chase after immortality.  Fear of aging is normal, but aging is unavoidable.