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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| Perseus Arm |
One of the spiral arms of the Milky Way Galaxy. It winds around from the far side of the galactic centre to the region of the Galaxy beyond the Sun.
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