Divided by Infinity

First published in 1998 in Starlight 2 (an anthology edited by Patrick Nielsen Hayden, Tor Books, ISBN 0-312-86184-2). Included in Robert Charles Wilson's collection The Perseids and Other Stories published in 2000 (Tor Books, ISBN 0-312-87374-3).
Nominated for Hugo Award for Best Novelette in 1999.