A star is a massive, luminous sphere of plasma held together by gravity. The nearest star to Earth is the Sun, which is the source of most of the energy on the planet. Other stars are visible from Earth during the night when they are not obscured by atmospheric phenomena, appearing as a multitude of fixed luminous points because of their immense distance. Historically, the most prominent stars on the celestial sphere were grouped together into constellations and asterisms, and the brightest stars gained proper names. Extensive catalogues of stars have been assembled by astronomers, which provide standardized star designations.
For at least a portion of its life, a star shines due to thermonuclear fusion of hydrogen into helium in its core, releasing energy that traverses the star's interior and then radiates into outer space. Almost all naturally occurring elements heavier than helium are created by stars, either via stellar nucleosynthesis during their lifetimes or by supernova nucleosynthesis when very massive stars explode. Near the end of its life, a star can also contain a proportion of degenerate matter. 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 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, hydrogen becomes steadily converted into helium through nuclear fusion, releasing energy in the process. 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, a star with at least 0.4 times the mass of the Sun expands 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 its matter into the interstellar environment, where it will form a new generation of stars with a higher proportion of heavy elements. Meanwhile, the core becomes a stellar remnant: a white dwarf, a neutron star, or (if it is sufficiently massive) a black hole.
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. Stars can form part of a much larger gravitationally bound structure, such as a cluster or a galaxy.
Read more about Star: Observation History, Designations, Units of Measurement, Formation and Evolution, Distribution, Characteristics, Radiation, Classification, Variable Stars, Structure, Nuclear Fusion Reaction Pathways
Other articles related to "star, stars":
... ( /ˈdeɪtə/ DAY-tə) is a character in the fictional Star Trek universe portrayed by actor Brent Spiner ... He appears in the television series Star Trek The Next Generation and the feature films Star Trek Generations, Star Trek First Contact, Star Trek Insurrection, and Star ... is in many ways a successor to the original Star Trek's Spock (Leonard Nimoy), in that the character offers an "outsider's" perspective on humanity ...
... the Cimmerian stories or Lev Grossman's Fillory, are global in scope and some, like Star Wars, Honorverse, or the Lensman series, are galactic or ... The classic Star Trek episode "Mirror, Mirror" introduced the Mirror Universe, in which the crew members of the Starship Enterprise were brutal rather than compassionate ... The 2009 movie Star Trek created an "alternate reality" and freed the Star Trek franchise from continuity issues ...
... different nuclear fusion reactions take place inside the cores of stars, depending upon their mass and composition, as part of stellar nucleosynthesis ... As a result the core temperature of main sequence stars only varies from 4 million kelvin for a small M-class star to 40 million kelvin for a massive O-class star ... producing all the energy necessary to sustain the star's radiation output ...
... See also List of stars in Caelum Caelum is a faint constellation, having no star brighter than fourth magnitude ... Its brightest star is the magnitude 4.45 α Caeli ... α Cae is a white-hued main sequence star of magnitude 4.4, 66 light-years from Earth ...
... Xi Geminorum (ξ Gem) is a star in the zodiac constellation Gemini with the traditional name Alzirr ... The star has an apparent visual magnitude of 3.35, which is bright enough for it to be seen with the naked eye ... Alzirr has a stellar classification of F5 IV, which is subgiant star that is in the process of evolving away from the main sequence of stars like the Sun ...
Famous quotes containing the word star:
“Don Pedro. To be merry best becomes you; for, out o question, you were born in a merry hour.
Beatrice. No, sure, my lord, my mother cried; but then there was a star danced, and under than was I born.”
—William Shakespeare (15641616)
“For rigorous teachers seized my youth,
And purged its faith, and trimmd its fire,
Showd me the high, white star of Truth,
There bade me gaze, and there aspire.
Even now their whispers pierce the gloom:
What dost thou in this living tomb?”
—Matthew Arnold (18221888)
“Far star that tickles for me my sensitive plate
And fries a couple of ebon atoms white....”
—Robert Frost (18741963)