To Open the Sky

From Author Wars - https://authorwars.com/publications/to-open-the-sky-450924.html

Overview:

Title: To Open the Sky
Author: Robert Silverberg
Year: 1983
ISBN-10: 0722178271
Publisher: Sphere
Price: £1.75
Pages: 203
Binding: Paperback
Type: Novel
Title Reference: To Open the Sky
Notes: Reprinted 1977, 1983.
Other prices A$5.95, Malta £1.75
Cover art not credited, but signed 'PE' on front side of ship and credited on page 59 of Cowley's "Great Space Battles"