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Star cluster: Quick Facts

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Photos and Videos

Centre of star cluster 47 Tucanae (NGC 104), showing the colours of various stars.Most of the brightest stars are older yellow stars, but a few young blue stars are also visible. This picture is a composite of three images taken by the Hubble Space Telescope.
Centre of star cluster M15, as observed by the Hubble Space Telescope.
Haffner 18
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.
A Hertzsprung-Russell diagram plots absolute visual magnitude against color index for Population II stars in a globular cluster, highlighting regions for horizontal branch, red giants, lower main sequence, blue stragglers, and the RR Lyrae gap. Spectral classes B through M are marked along the top axis.
Globular cluster 47 Tucanae (NGC 104).
NGC 6705, a rich open cluster.
globular cluster NGC 1850 in the Large Magellanic Cloud
Star cluster G1 (Mayall II) in the Andromeda Galaxy, as observed by the Hubble Space Telescope.
M3, globular cluster
Diagram of the Milky Way galaxy showing labeled locations of the Sun, Milky Way center, Sagittarius dwarf elliptical, and Canis Major dwarf, with axes marking 80,000 light-years.
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Key People

William Herschel
William Herschel
British-German astronomer
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Charles Messier
French astronomer

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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.
All About Astronomy