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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| Egg Nebula |
Popular name for a planetary nebula also known by the catalogue number CRL2688. It is a very young planetary nebula and the central star is hidden behind a ring of dust. Numerous shells of gas ejected by the star, which was a red giant until a few hundred years ago, are illuminated by light from the central star.
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