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3 days ago · 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.
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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.
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...
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.
6 days ago · Last Updated: Jul 22, 2024 • Article History. stellar evolution. Throughout the Milky Way Galaxy (and even near the Sun itself), astronomers have discovered stars that are well evolved or even approaching extinction, or both, as well as occasional stars that must be very young or still in the process of formation.
