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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| Owl Nebula M97; Ngc 3587 |
A planetary nebula in the constellation Ursa Major. It is one of the largest planetary nebulae known, with a diameter of 1.5 light years, and lies at a distance of 1,600 light years.
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