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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| Red Rectangle |
A red nebula around the star HD 44179, detected in 1975 during a survey of infrared sources. The emission, which is intrinsic to the nebula and not scattered or reflected light, is in a broad band in the red part of the spectrum, peaking at about 640 nanometres. It is the strongest known source of this red emission, which may be a result of luminescence from hydrogenated amorphous carbon dust.
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