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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| Island Universe |
An obsolete term, formerly used to mean a giant galaxy. It is associated particularly with the philosopher Immanuel Kant 1724-1804, who introduced it in 1755. It was used until the 1920s in popular writing.
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