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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| F Star |
A star of spectral type F. F stars on the main sequence have surface temperatures in the range 6,000-7,400 K. Their spectra are characterized by strong absorption lines of ionized calcium the H and K lines, which are stronger than the hydrogen lines. There are also many medium-strength absorption lines due to iron and other heavier elements. Procyon and Polaris are examples of F stars.
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