The Dark Side of the Sun

The story is set in a portion of the galaxy populated by fifty-two different sentient species. All of these species, humanity among them, have evolved in the last five million years, and all of them have evolved in a spherical volume of space less than two hundred light-years across centred on Wolf 429. The rest of the galaxy is sterile as far as anybody can tell.

Scattered irregularly across this "life-bubble" are ancient artefacts of a mysterious race called the Jokers, who apparently became extinct long before any of the current races arose. These artefacts are usually astounding feats of engineering (such as a pair of stars shaped into rings and joined like links in a chain), but leave no hints about the Jokers' physical form or day-to-day life. The only piece of translatable Joker text is a poem, which cryptically states that they have gone to their new home, which "lies at the dark side of the sun".