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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| Whirlpool Galaxy M51; Ngc 5194 |
A face-on spiral galaxy in the constellation Canes Venatici at a distance of 13 million light years. It was the first galaxy to be recognized as having spiral structure when it was observed by Lord Rosse in 1845. It is accompanied by a much smaller irregular galaxy, NGC 5195, which is in orbit around it.
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