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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| Ozone |
A form of molecular oxygen containing three atoms instead of the normal two. It is created by the action of ultraviolet light on air or oxygen. A layer of ozone in the Earth’s upper atmosphere at a height of about 25-40 kilometres 15-25 miles serves as a protective barrier against ultraviolet light from the Sun, which is harmful to life.
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