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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| Lagoon Nebula M8; Ngc 6523 |
A luminous nebula in the constellation of Sagittarius. It is a complex of ionized hydrogen, gas and dust with hot, recently formed stars. A star cluster, NGC 6530, lies near the centre of the nebula. The light from two naked-eye stars in the cluster, 7 and 9 Sagittarii, is responsible for ionizing the gas. The nebula is estimated to lie at a distance of 4,500 light years.
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