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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| Van Biesbroeck’s Star |
The companion to the star BD+4°4048, which, at the time of its discovery by George van Biesbroeck 1880-1974, was the least luminous known star. Its absolute magnitude is +18.
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