STS-39 was the twelfth mission of the NASA Space Shuttle Discovery, and the 40th orbital shuttle mission overall. The primary purpose of the mission was to conduct a variety of payload experiments for the U.S. Department of Defense (DoD).
Key Facts
| Subject | STS-39 |
| Category | 1991 American crewed spaceflight for the Department of Defense |
| Reading time | 1 min · Beginner |
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