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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| Kelvin |
The SI unit in which temperature is measured. It is defined formally as the fraction 1/273.16 of the thermodynamic temperature of the triple point of water. One kelvin corresponds to an interval of one degree on the Celsius scale. The kelvin temperature scale starts from absolute zero, which is -273.16°C.
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