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star cluster
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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 galaxy Hertzsprung-Russell diagram 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
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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
galaxy
Hertzsprung-Russell diagram
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
The scale of the universe: Earth's solar system and beyond
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Key People

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

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Quiz
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
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