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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| Cat’s Eye Nebula |
A popular name for the planetary nebula NGC 6543. It is about 3,000 light years away and lies in the constellation Draco. Estimated to be about 1,000 years old, its intricate structure suggests that there is a binary star at its centre.
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