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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| Delta Delphini Star δ Del Star |
A member of a group of luminous stars of spectral type A and F, characterized by weak absorption lines of calcium in their spectra. The star Delta Delphini is the brightest of the group and regarded as the prototype. Some are low-amplitude, short-period variables similar to the Delta Scuti stars, and they may also be related to the Am stars.
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