“To the Stars” Part 2 also published as “Return to Tomorrow” by L. Ron Hubbard
Publication date: March 1950
Original publication: Astounding Science Fiction
Genre: Science Fiction
Story description: They are outcasts of time—space voyagers among the distant stars, rootless exiles from a world they left that has aged and passed away even as they remain young. Alan Corday seeks understanding of his mission in life, in a world—unfamiliar, inhospitable—altered by the relative passage of time; at the end, he is the new commander of the symbolically named starship Hound of Heaven.
Currently available in the book To the Stars.