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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| Gemini 1 The Twins |
One of the twelve constellations of the zodiac in the list drawn up by Ptolemy c. AD 140. The two brightest stars in Gemini, both first magnitude, bear the names of the twins Castor and Pollux of classical mythology. Pollux, though the brighter of the pair, was given the designation β Beta by Johann Bayer.
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