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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. This article describes the properties and evolution of individual stars. Included in the discussion are the sizes, energetics, temperatures, masses, and chemical compositions of stars.
People have interpreted patterns and images in the stars since ancient times. [4] This 1690 depiction of the constellation of Leo, the lion, is by Johannes Hevelius. [5] Historically, stars have been important to civilizations throughout the world.
Mar 20, 2019 · By plotting these and other variables on a graph called the Hertzsprung-Russell diagram, astronomers can classify stars into groups. Along with main sequence and white dwarf stars, other groups...
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Parañaque, officially the City of Parañaque (Filipino: Lungsod ng Parañaque, Tagalog pronunciation: [paɾaˈɲäke̞]), is a first class highly urbanized city in the National Capital Region of the Philippines. According to the 2020 census, it has a population of 689,992 people.
The outward pressure of gas heated by fusion is balanced by the inward pull of gravity, leaving the star in hydrostatic equilibrium. This balance of forces lasts for most of a star’s life, maintaining its steady temperature. Radiation and convection carry the energy from the core out through a star’s atmosphere.
More massive stars must burn fuel at a higher rate to generate the energy that keeps them from collapsing under their own weight. Some low-mass stars will shine for trillions of years – longer than the universe has currently existed – while some massive stars will live for only a few million years.
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Jul 15, 2014 · A star is a luminous ball of gas, mostly hydrogen and helium, held together by its own gravity. Nuclear fusion reactions in its core support the star against gravity and produce photons and heat, as well as small amounts of heavier elements. The Sun is the closest star to Earth.
Sep 26, 2022 · Stellar evolution. The life cycles of stars follow patterns based mostly on their initial mass. These include intermediate-mass stars such as the sun, with half to eight times the mass of the...
