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open cluster
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The Pleiades gravitational lens Galactic cluster open cluster NGC 290 NGC 6705, a rich open cluster. Distant galactic cluster, as observed by the Hubble Space Telescope.This group consists mainly of irregular galaxies; its red colour is a product of red shift. galaxy cluster galaxy
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Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
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The Pleiades
The Pleiades

open cluster

astronomy
Also known as: galactic cluster
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History

open cluster, in astronomy, any group of young stars held together by mutual gravitation. See star cluster.

This article was most recently revised and updated by Amy Tikkanen.