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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| Utopia Planitia |
An extensive, sparsely cratered plain in the northern hemisphere of Mars. It was the landing site for the Viking 2 spacecraft. Panoramic images returned by the Viking lander showed terrain littered with large numbers of boulders made of open-textured rock.
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