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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| Hercules X-1 |
An X-ray pulsar in the constellation Hercules, consisting of a rotating neutron star which is accreting matter from its companion in a binary system. The rotation period of the neutron star is 1.2 seconds and the orbital period of the system 1.7 days.
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