what are the four characteristics of a star?
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Key Concept: Characteristics used to classify stars include color, temperature, size, composition, and brightness.
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['A Giant Gas Cloud. A star begins life as a large cloud of gas. ... ', 'A Protostar Is a Baby Star. ... ', 'The T-Tauri Phase. ... ', 'Main Sequence Stars. ... ', 'Expansion into Red Giant. ... ', 'Fusion of Heavier Elements. ... ', 'Supernovae and Planetary Nebulae.']
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['Introduction.', 'Characteristics. Religion. Deeds. Human Values. Obedience. Bravery. Love. Morality. Poetic Form. Other Literature.']
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Astronomers classify stars according to their physical characteristics. Characteristics used to classify stars include color, temperature, size, composition, and brightness. Stars vary in their chemical composition.
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Most stars are classified as dwarfs, including the Sun. These stars lie on the main sequence, the phase of life in which a star steadily converts the hydrogen fuel in its core to helium. When the core hydrogen has been depleted, the star gets larger, cooler, and brighter.
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Luminosity classes are labeled with Roman numerals from I to V: I are supergiant stars, II are bright giants, III are ordinary giants, IV are subgiants, and V are ordinary main sequence stars. The complete spectral classification for a star is then given by specifying both the spectral class and the luminosity class.
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Dwarf star, any star of average or low luminosity, mass, and size. Important subclasses of dwarf stars are white dwarfs (see white dwarf star) and red dwarfs. Dwarf stars include so-called main-sequence stars, among which is the Sun.
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['Brightness. Two characteristics define brightness: luminosity and magnitude. ... ', "Color. A star's color depends on its surface temperature. ... ", 'Surface Temperature. ... ', 'Size. ... ', 'Mass.']
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['Yellow Dwarf Stars. Lifetime: 4 - 17 billion years. ... ', 'Orange Dwarf Stars. Lifetime: 17 - 73 billion years. ... ', 'Red Dwarf Stars. Lifetime: 73 - 5500 billion years. ... ', 'Brown Dwarfs. Lifetime: unknown (long) ... ', 'Blue Giant Stars. Lifetime: 3 - 4,000 million years. ... ', 'Red Giant Stars. ... ', 'Red Supergiant Stars. ... ', 'White Dwarfs.']
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Stars are remarkably simple objects: their mass and age determine the basic properties. This lecture discusses how we determine the distance and luminosity of stars and how this relates to the Star's size and temperature.
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['It must orbit a star (in our cosmic neighborhood, the Sun).', 'It must be big enough to have enough gravity to force it into a spherical shape.', 'It must be big enough that its gravity cleared away any other objects of a similar size near its orbit around the Sun.']
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Characteristic properties of_matter. ... Characteristic Properties of Matter—The Key Ideas The physical properties of matter include color, odor, density, solubility, melting point, boiling point, and electrical conductivity. These are properties that can be observed without chemically changing the substance.
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Characteristics used to classify stars include color, temperature, size, composition, and brightness. Stars vary in their chemical composition. Astronomers use spectrographs to determine the elements found in stars.
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['(1) The characteristics of gases are described fully in terms of four parameters or measurable properties:', '(i) The volume, V, of the gas.', '(ii) Its pressure, P.', '(iii) Its temperature, T.', '(iv) The amount of the gas (i.e., mass or number of moles).']
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There are four sound qualities: pitch, duration, intensity and timbre.
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A star's brightness, or luminosity, depends on the star's surface temperature and size. If two stars have the same surface temperature, the larger star will be more luminous. The Hertzsprung-Russell (H-R) diagram below is a scatter plot that shows the relative temperatures and luminosities of various stars.
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Characteristics. The Sun consists of about 70% Hydrogen, 28% Helium and 2% of metals such as iron. Other characteristics are its rotation, temperature, and radiation.