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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| Zero-Age Main Sequence (ZAMS) |
For a population of stars, such as a cluster, formed at the same time, the main sequence on the Hertzsprung-Russell diagram as it would have been at the start of their hydrogen-burning phase.
See also: stellar evolution. |