Star

A star is a luminous sphere of plasma held together by its own gravity. The nearest star to Earth is the Sun. Other stars are visible to the naked eye from Earth during the night, appearing as a multitude of fixed luminous points in the sky due to their immense distance from Earth. Historically, the most prominent stars were grouped into constellations and asterisms, and the brightest stars gained proper names. Extensive catalogues of stars have been assembled by astronomers, which provide standardized star designations.

For at least a portion of its life, a star shines due to thermonuclear fusion of hydrogen into helium in its core, releasing energy that traverses the star's interior and then radiates into outer space. Once the hydrogen in the core of a star is nearly exhausted, almost all naturally occurring elements heavier than helium are created by stellar nucleosynthesis during the star's lifetime and, for some stars, by supernova nucleosynthesis when it explodes. Near the end of its life, a star can also contain degenerate matter. Astronomers can determine the mass, age, metallicity (chemical composition), and many other properties of a star by observing its motion through space, luminosity, and spectrum respectively. The total mass of a star is the principal determinant of its evolution and eventual fate. Other characteristics of a star, including diameter and temperature, change over its life, while the star's environment affects its rotation and movement. A plot of the temperature of many stars against their luminosities, known as a Hertzsprung–Russell diagram (H–R diagram), allows the age and evolutionary state of a star to be determined.

This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Star

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U.S. Internet star "IShowSpeed" explores the magic of Chongqing

Xinhua 03 Apr 2025
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Pinkvilla 03 Apr 2025
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No Sundance, no problem. These celebs are coming to Cincinnati in April

Cincinnati.com 03 Apr 2025
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CBS Sports 03 Apr 2025
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The Capital Journal 03 Apr 2025
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Usatoday 03 Apr 2025
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Asus’ 3K OLED laptop with killer battery life is $400 off right now

PC World 03 Apr 2025
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"Over the last eight years, he has consistently been one of the top batters and a match-winner in world cricket.": Kane Williamson on Butler's match winning innings

Beijing News 03 Apr 2025
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Jack Black dreams of retirement but can't stop making movies

Detroit news 03 Apr 2025
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Jack Black loses his pants in wardrobe malfunction during ‘Tonight Show’ interview

New York Post 02 Apr 2025
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Megan Rapinoe heaps praise on USWNT youngsters: 'It's the depth that really wins' tournaments

CBS Sports 02 Apr 2025
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