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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| Rho Ophiuchi Cloud ρ Oph Cloud |
A large nebulous region near the star Rho Ophiuchi ρ Oph. It is a mixture of reflection nebulae, emission nebulae, dark absorption nebulae and molecular clouds, and is relatively close, at a distance of about 700 light years. Infrared observations reveal the presence of a cluster of at least 40 stars within the dark cloud. This is a region of very active star formation and contains many T Tauri stars and Herbig-Haro objects.
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