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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| Forty-Seven Tucanae 47 Tuc; Ngc 104 |
The second-brightest globular cluster in the sky after Omega Centauri. To the naked eye it appears as a fifth magnitude star; this explains why it was originally designated 47 Tucanae, a form of name appropriate to a single star. It lies at a distance of 13,000 light years and is a relatively young globular cluster.
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