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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| Advanced Composition Explorer Ace |
A US spacecraft, launched in August 1997, carrying nine scientific instruments for determining the isotopic and elemental composition of the solar corona, the interplanetary medium, the local interstellar medium and galactic material. It was placed in solar orbit, at one of the Earth’s Lagrangian points, 1.5 million km nearer the Sun than the Earth, where it will maintain an almost constant position relative to the Earth.
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