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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| Residual |
The difference between an actual observed quantity and its predicted or expected value. Residuals may result from observational error, basic limitations on the accuracy with which the observations can be made, or inaccuracy in the prediction with which the observation is compared.
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