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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| Janus |
A small satellite of Saturn, discovered by Audouin Dollfus in 1966 when the ring system was edge-on as seen from Earth. Janus orbits just beyond the outer edge of the ring system and is co-orbital with Epimetheus. The two may be fragments of a larger object that was shattered by an impact. Janus is irregular in shape, measuring 220 × 160 kilometres.
See also: co-orbital satellite
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