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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| Ophiuchus (The Serpent Bearer) |
A large constellation straddling the celestial equator. It was one of the 48 constellations listed by Ptolemy c. AD 140. The mythological figure of the serpent holder is sometimes identified with the healer Aesculapius. Though Ophiuchus is not traditionally a zodiacal constellation, the ecliptic passes through its southern part. It contains five stars of second magnitude and seven of third magnitude. Barnard’s Star also lies in Ophiuchus.
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