Stars

Stars

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Credit: ROGER HARRIS/SCIENCE PHOTO LIBRARY

Caption: Stars. Computer artwork showing a combination of stars of different colours, sizes and brightness. The colour of a star will depend on several of its properties, including its chemical composition, but in general a high-mass star is hot and blue, while a low-mass star is cool and red. Medium- mass stars, like the Sun, will be yellow. A star's appearance also changes during its lifetime, as it can expand and form a red giant star, and then contract to form a white dwarf star. The apparent brightness of a star will depend upon its distance, its luminosity (how much light it emits per unit area) and its size.

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Keywords: absolute magnitude, artwork, astronomical, astronomy, astrophysics, blue, brightness, classification, colour, colours, composition, cosmology, evolution, giant, illustration, large, luminiosity, magnitude, main sequence, many, multiple, red, science, size, space, spectral class, star, starfield, stars, stellar, supergiant, taxonomy, temperature, type, universe, yellow

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