Star
In space and astronautical engineering, a star is a massive, luminous sphere of plasma held together by its own gravity. Stars emit energy in the form of light and heat due to nuclear reactions occurring at their core. The study of stars is important in understanding the evolution of galaxies and the universe as a whole. Astronomers use various techniques to observe and analyze stars, including spectroscopy, photometry, and astrometry. Stars are classified based on their spectral characteristics, luminosity, and temperature. The most common types of stars are main sequence stars, which fuse hydrogen into helium in their cores. Other types of stars include red giants, white dwarfs, and neutron stars. Stars play a crucial role in space exploration, as they are used as reference points for navigation and as targets for scientific observation.
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