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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| Nereid |
The small outermost moon of Neptune, discovered by Gerard Kuiper in 1949. The best Voyager 2 image obtained was from a distance of 4.7 million kilometres 2.9 million miles, not sufficiently close to reveal surface detail but good enough to obtain a more precise diameter of 170 kilometres 105 miles.
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