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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| Libra The Scales |
One of the twelve zodiacal constellations listed by Ptolemy c. AD 140, though its stars were previously regarded as part of the Scorpion, which is next to it. Libra is one of the least conspicuous constellations in the zodiac, with just five stars brighter than fourth magnitude.
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