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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| Helix Nebula Ngc 7293 |
A large, ring-shaped planetary nebula in the constellation Aquarius. Its apparent diameter is a quarter of a degree half the size of the full Moon and, at a distance of about 500 light years, it is the nearest planetary nebula.
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