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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| Helium Flash |
An explosive event in the interior of a low-mass star less than two solar masses marking the start of helium burning when all the hydrogen available for nuclear fusion in the core has been exhausted.
See also: stellar evolution.
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