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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| Phocaea Group |
A group of asteroids at a distance of 2.36 AU from the Sun, with orbits inclined at 24° to the plane of the solar system. The group is separated from the main belt by one of the Kirkwood gaps and is not a true family with a common origin. The group is named after 25 Phocaea, diameter about 70 km 45 miles.
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