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A star’s mass determines its nuclear fusion rate, and thus its luminosity (energy output) and its life expectancy. We define four broad mass categories, based on a star’s lifetime, how it dies, and the stellar remnant it leaves. The “life” of a star is the stable stage when it is fusing hydrogen to helium in its core.
Many star names are, in origin, descriptive of the part in the constellation they are found in; thus Phecda, a corruption of Arabic فخذ الدب ( fakhdh ad-dubb, 'thigh of the bear'). Only a handful of the brightest stars have individual proper names not depending on their asterism; so Sirius ('the scorcher'), Antares ('rival of Ares ', i.e ...
Synonym Discussion of Loll. to hang loosely or laxly : droop; to act or move in a lax, lazy, or indolent manner : lounge; to let droop or dangle… See the full definition
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.
- What Is A star?
- Where Do Stars Come from?
- Types of Stars
We're all pretty familiar with stars. We see themon most clear nights as tiny, twinkling pinpricks of light in the sky. Stars are the topic of countless poems, stories, and nursery rhymes alike. But just what is a star, exactly? A star is a luminous ball of gas, mostly hydrogen and helium, held together by its own gravity. Nuclear fusion reactions ...
According to current star formation theory, stars are born as clumps within gigantic gas clouds that collapse in on themselves. The cloud’s material heats up as it falls inward under the force of its own gravity. When the gas reaches about 10 million K (18 million °F), hydrogen nuclei begin to fuse into helium nuclei, and the star is born. Energy f...
A star’s color relies on its temperature: hotter stars emit bluer light and cooler stars emit redder light. Temperature is also correlated to mass. Red dwarf stars have as little as 0.075 solar masses and a visible surface temperature less than 4,000 K. The most massive star known is R136a1, a Wolf-Rayet star 265 times the Sun’s mass — its visible ...
Sep 16, 2020 · A visualization flying into the nebula Gum 29 and the star cluster Westerlund 2 at its core. All stars are born in clouds of dust and gas like the Pillars of Creation in the Eagle Nebula pictured below. In these stellar nurseries, clumps of gas form, pulling in more and more mass as time passes. As they grow, these clumps start to spin and heat up.
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Stars form in large clouds of gas and dust called molecular clouds. Molecular clouds range from 1,000 to 10 million times the mass of the Sun and can span as much as hundreds of light-years. Molecular clouds are cold which causes gas to clump, creating high-density pockets. Some of these clumps can collide with each other or collect more matter ...
