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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| North Polar Sequence |
A list of about a hundred stars, all lying within two degrees of the north celestial pole and covering a wide range of brightness, which are used as standards for the astronomical magnitude scale. They were selected so they can be observed for comparison purposes at any time of the year from northern observatories.
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