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Jun 17, 2024 · star, any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources. Of the tens of billions of trillions of stars composing the observable universe, only a very small percentage are visible to the naked eye. Many stars occur in pairs, multiple systems, or star clusters.
The stellar temperature will determine the rate of ionization of various elements, resulting in characteristic absorption lines in the spectrum. The surface temperature of a star, along with its visual absolute magnitude and absorption features, is used to classify a star (see classification below).
After millions of years, immense pressures and temperatures in the star’s core squeeze the nuclei of hydrogen atoms together to form helium, a process called nuclear fusion. Nuclear fusion releases energy, which heats the star and prevents it from further collapsing under the force of gravity.
Mar 20, 2019 · Most of the stars in our galaxy, including the sun, are categorized as main sequence stars. They exist in a stable state of nuclear fusion, converting hydrogen to helium and radiating x-rays....
Jan 28, 2022 · A star is born. First off, a decent enough astrophysical definition of a star is: any object that is sufficiently massive that it can ignite the fusion of elements in its core due to the ...
2 days ago · A first-time All-Star having a career season for the Red Sox, 27-year-old Jarren Duran was named MVP of the 2024 Midsummer Classic, his two-run home run in the fifth inning breaking a 3-3 tie for ...
