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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 Diagram showing the side view outline of the Milky Way Galaxy with yellow dots representing the distribution of globular star clusters surrounding the galactic disk, and a cross marking the Sun's position.
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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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Robert Julius Trumpler
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The Pleiades
The Pleiades

Open cluster

astronomy
Also known as: galactic cluster
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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.