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A
star is a massive, luminous ball of plasma that is held together by its own gravity. The nearest
star to Earth is the Sun, which is the source of most of
...en.wikipedia.orgStars is a Juno Award-nominated Canadian indie pop band. Originally formed in Toronto by vocalist Torquil Campbell and keyboardist Chris Seligman,
...en.wikipedia.org
MySpace music profile for
Stars with tour dates, songs, videos, pictures, blogs, band information, downloads and more.
www.myspace.comNov 21, 2008
... STARS presents a comprehensive suite of pages that tell the stories of
stars and their constellations. Please explore and enjoy.
...www.astro.uiuc.eduSTARS' Eridanus featured on Astronomy Picture of the Day. Portraits of
Stars and their Constellations. Dedicated to showing that all
stars are not the same
...www.astro.uiuc.edu
Dallas
Stars news, scores, photos, blogs, stats, injuries, transactions, schedule, tickets as well as truth and rumors and Fantasy news from around the web
...sportsillustrated.cnn.comBrief information on both
stars and constellations, including the sun. Features definitions of constellations and a list of the 26 brightest
stars in the
...www.astro.wisc.eduAug 22, 2008
... Provides extensive information about
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imagine.gsfc.nasa.gov
Wikipedia
Star
From Wikipedia, the free encyclopedia
(Redirected from Stars)
This article is about the astronomical object. For other uses, see Star (disambiguation).
The Pleiades, an open cluster of stars in the constellation of Taurus. NASA photo
A star is a massive, luminous ball of plasma. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth. Other stars are visible in the night sky, when they are not outshone by the Sun. For most of its life, a star shines because thermonuclear fusion in its core releases energy that traverses the star's interior and then radiates into outer space. Almost all elements heavier than hydrogen and helium were created by fusion processes in stars.
Astronomers can determine the mass, age, chemical composition and many other properties of a star by observing its spectrum, luminosity and motion through space. The total mass of a star is the principal determinant in its evolution and eventual fate. Other characteristics of a star are determined by its evolutionary history, including the diameter, rotation, movement and temperature. A plot of the temperature of many stars against their luminosities, known as a Hertzsprung-Russell diagram (H–R diagram), allows the age and evolutionary state of a star to be determined.
A star begins as a collapsing cloud of material composed primarily of hydrogen, along with helium and trace amounts of heavier elements. Once the stellar core is sufficiently dense, some of the hydrogen is steadily converted into helium through the process of nuclear fusion.[1] The remainder of the star's interior carries energy away from the core through a combination of radiative and convective processes. The star's internal pressure prevents it from collapsing further under its own gravity. Once the hydrogen fuel at the core is exhausted, those stars having at least 0.4 times the mass of the Sun[2] expand to become a red giant, in some cases fusing heavier elements at the core or in shells around the core. The star then evolves into a degenerate form, recycling a portion of the matter into the interstellar environment, where it will form a new generation of stars with a higher proportion of heavy elements.[3]
Binary and multi-star systems consist of two or more stars that are gravitationally bound, and generally move around each other in stable orbits. When two such stars have a relatively close orbit, their gravitational interaction can have a significant impact on their evolution.[4]
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