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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| Light Year L.Y. |
The distance travelled through a vacuum by light or any other form of electromagnetic radiation in one year. A light year is equivalent to 9.4607 × 1012 kilometres, 63,240 astronomical units or 0.306 60 parsecs.
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