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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| Tharsis Ridge |
A raised volcanic area on Mars, 10 kilometres 6 miles above the datum level for the planet. Three large volcanoes, rising to 27 kilometres 17 miles above the datum level, lie in a line along the ridge. They are Arsia Mons, Pavonis Mons and Ascraeus Mons.
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