Abstract illustration of dark matter

Abstract illustration of dark matter

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Credit: LYNETTE COOK/SCIENCE PHOTO LIBRARY

Caption: Dark matter. Abstract illustration of dark matter showing a spiral galaxy as a jigsaw puzzle with many of the pieces missing. Dark matter is a theoretical concept used by cosmologists to explain why the stars in a galaxy stay together. The gravitational force within a galaxy can be determined by its rotational period. The mass of the stars can be calculated by measuring their luminosity. Cosmologists estimate that only about 10% of the gravitational force holding galaxies together comes from visible mass. Theoreticians have suggested that the other 90% comes from dark matter made of subatomic particles or compact, non-luminous material such as asteroids.

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Keywords: abstract, art, artwork, astronomy, cosmology, dark matter, galaxy, galaxy artwork, jigsaw puzzle, science, space, spiral galaxy, universe

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