Space exploration began with the launch of Sputnik and Astrophysics was born as the application of physics to the phenomena observed by Astronomy, which etymologically means laws of the stars.
There are 2759 entries in this glossary.| Term | Definition |
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| Ranger |
A series of nine American lunar probes, launched between 1961 and 1965. Only the last three, Rangers 7, 8 and 9, were successful. Ranger 7, launched in July 1964, returned 4,000 images. Thousands more were obtained with Rangers 8 and 9, launched in February and March 1965. They were hard landers, designed to transmit images during approach to the Moon until they crash-landed. The three successful Rangers landed successively in the Fra Mauro region, the Mare Tranquillitatis and the crater Alphonsus.
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