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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| Mars Observer |
An unmanned NASA mission to Mars, successfully launched in 1992, but lost presumed destroyed on its arrival at Mars in September 1993. The probe had been intended to orbit around Mars, undertaking detailed mapping and remote sensing for one martian year. Replacements for six of the eight instruments lost were subsequently carried on Mars Global Surveyor.
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