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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| Hellas Planitia |
An almost circular impact basin on the surface of Mars. Hellas Planitia is 1,800 kilometres 1,100 miles in diameter and is a feature that has long been recognized and mapped, being conspicuous by its colour, which is lighter than surrounding areas. It was formerly known simply as Hellas.
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