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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| Elliptical Galaxy |
A galaxy with an ellipsoidal shape and no spiral structure. In most there is no evidence of interstellar matter nor sign of recent star formation. Elliptical galaxies differ only in mass and shape. Almost all their stars are older than about 10 to the power of 10 years, and much of their light comes from red giant stars. About 80 per cent of normal galaxies are elliptical.
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