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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| Sagittarius Arm |
One of the spiral arms of the Galaxy. It lies between the Sun and the centre of the Galaxy in the direction of the constellation Sagittarius.
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