Endings

Some future history series end with a short work set in a further future as a kind of culmination.

Poul Anderson

The Technic History: "Starfog," civilizations in two or three spiral arms.

The Polesotechnic League: "The Chapter Ends," humanity leaves Earth.

If "The Chapter Ends" is disputed: The Peregrine, a Coordinator joins the Nomads.

Twilight World: Epilogue, descendants of mutants terraform the outer satellites.

Robert Heinlein

The Future History: Orphans Of The Sky, the fate of the first interstellar spaceship.

James Blish

The Seedling Stars: "Watershed," Adapted Men colonize the changed Earth.

Larry Niven

Known Space: "Safe At Any Speed," a short feel-good ad when human beings are becoming genetically lucky.

It is as if an editor had asked these four authors to write short culminations for these six series.