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Copy and paste Star Symbol (★, ⋆, , , and more). Check Alt Codes and learn how to make specific symbols on the keyboard.
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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...
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.
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.
4 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.
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Jul 9, 2024 · NASA science games, articles and activities for kids.
