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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| A Star |
A star of spectral type A. A stars have surface temperatures in the range 7,500-11,000 K and are white in colour. The most prominent features in their absorption line spectra are the Balmer lines due to hydrogen atoms. Lines of heavier elements, such as iron, are also noticeable at the cooler end of the temperature range. Examples of A stars are Sirius and Vega.
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