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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| Magellanic Clouds |
Two small, irregular galaxies, which are satellites of our own Galaxy. They are visible as hazy patches in the southern sky. The Large Magellanic Cloud LMC is in the constellation Dorado and is about 170,000 light years away. The Small Magellanic Cloud SMC, in Tucana, is about 210,000 light years distant.
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