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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| Leo The Lion |
One of the twelve zodiacal constellations, included by Ptolemy in his list of 48 c. AD 140. The pattern made by the brightest stars of this large and conspicuous constellation bear some resemblance to the outline of a lion in profile. The asterism outlining the head is known as the Sickle. There are ten stars brighter than fourth magnitude, the brightest being Regulus and Denebola. Leo also contains numerous galaxies, including five from the Messier Catalogue M65, M66, M95, M96 and M105.
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