| Author | C. S. Lewis |
| Series | Space Trilogy |
| Publisher | Pan Books Ltd |
| Printed by | Cox & Wyman Ltd |
| Format | Paperback |
| Language | English |
| Location | UK |
| This Edition Published | 1953 |
| Reprinted | 1971 |
| Pages / Font | 205 pages |
| ISBN | 0 330 02171 0 |
| Price | UK 25p (5/-) / Australia 80c / New Zealand 80c / South Africa 60c / Canada 95c |
| Impression/Printing No. | 11 |
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