Omega by Jack McDevitt [FIRST PAPERBACK PRINTING] 2003
Omega by Jack McDevitt [The Academy IV]
FIRST PAPERBACK PRINTING  ACE SCIENCE FICTION
Book is in excellent condition. Light shelf wear and tanning to pages.
Reads like new.
A civilization-destroying omega cloud has switched direction, heading straight for a previously unexplored planetary system--and its alien society. And suddenly, a handful of brave humans must try to save an entire world--without revealing their existence.