| Timeline | |||
| Centuries: | 19th Century | 20th Century | 21st Century |
| Years: | 1975 | 1976 | 1977 |
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- 20: The NASA unmanned probe Viking 1 lands on Mars. It is the first Human craft to reach the fourth planet of the Sol System.
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- 1: The Space Shuttle Enterprise is completed by the United States on Earth. It will be the test craft for the first Human reusable space craft.