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.
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| Epimetheus |
A small satellite of Saturn, discovered in 1980. It is co-orbital with Janus, the orbit lying just beyond the limit of the main ring system. The two satellites may be fragments of a larger object that was shattered by an impact. It is irregular, measuring 140 × 100 kilometres.
See also: co-orbital satellites
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