| Author | C. S. Lewis |
| Series | Space Trilogy |
| Publisher | The Macmillan Company |
| Format | Mass-Market Paperback |
| Language | English |
| Location | United States Of America |
| Copyright | 1944 |
| This Edition Published | 1965 |
| Reprinted | 1972 |
| Pages / Font | 222 pages |
| Series Number | 2 |
| Catalog Number | 08690 |
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