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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| Absolute Magnitude |
The supposed brightness an object in space would be at a distance of 10 parsecs, or 33 light years; a measurement obtained by finding the objects apparent magnitude m and it’s parallax PI in arcseconds with the formula M = m + 5 + 5logPI. Absolute magnitude is used by astronomers to compare the brightness of different objects in space.
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