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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| Radiometer |
Any instrument for measuring the total amount of electromagnetic radiation received from an object. In infrared astronomy, the term is applied to a device designed to measure only infrared flux. In radio astronomy, a radiometer is a detector able to measure with great accuracy the total radio energy received.
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