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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| Leap Year |
A year containing 366 days instead of the normal 365. Leap years are a feature of the Julian calendar and the Gregorian calendar and were introduced to ensure that the calendar year keeps step with the seasons.
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