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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| Bar |
A unit in which pressure is measured, particularly planetary atmospheric pressure. One bar is close to the average pressure of the Earth’s atmosphere at sea level, and is equal to 105 pascals newtons per square metre. Atmospheric pressures are often quoted in millibars 1,000 mbar = 1 bar.
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