| 单词 | tranquillitatis, mare |
| 释义 | Tranquillitatis, MareTranquillitatis, Mare(trang-kwil-ă-tah -tiss) (Sea of Tranquillity) An ancient irregular mare on the eastern nearside of the Moon. It was the landing area for Ranger 8, Surveyor 5, and Apollo 11 (Tranquillity Base was the first manned landing point). The basaltic lavas in the mare are 3900 to 3600 million years old. |
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