Then he decided that nothing was more impractical than misplaced practicality. - Poul Anderson

What, after all, what is the most logical way for superman to evolve? Not in one fantastic mutation of unknown thousands of genes all working to produce the same results: the very formulation was an insult to the laws of probability. No, homo superior should have evolved from homo sapiens in the same way that other species had evolved from a parent stock—by isolation of a few not very different mutations, selection and intensification of the new traits, new mutations gradually appearing and being lost if they were unfavorable, being incorporated if they gave some advantage.

One light-year is not much as galactic distances go. You could walk it in about 270 million years, beginning at the middle of the Permian Era, when dinosaurs belonged to the remote future, and continuing to the present day.

Better a life like a falling star, bright across the dark, than a deathlessness which can see naught above or beyond itself.