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13 relations: Billion years, Caldwell catalogue, Cambridge University Press, Corona Australis, Epoch (astronomy), Globular cluster, Hubble Space Telescope, James Dunlop, Monthly Notices of the Royal Astronomical Society, New General Catalogue, Niccolò Cacciatore, Palermo Astronomical Observatory, Sicily.
Billion years
A billion years (109 years) is a unit of time on the petasecond scale, more precisely equal to seconds.
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Caldwell catalogue
The Caldwell Catalogue is an astronomical catalogue of 109 star clusters, nebulae, and galaxies for observation by amateur astronomers.
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Cambridge University Press
Cambridge University Press (CUP) is the publishing business of the University of Cambridge.
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Corona Australis
Corona Australis is a constellation in the Southern Celestial Hemisphere.
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Epoch (astronomy)
In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.
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Globular cluster
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.
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Hubble Space Telescope
The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation.
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James Dunlop
James Dunlop FRSE (31 October 1793 – 22 September 1848) was a Scottish astronomer, noted for his work in Australia.
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Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal covering research in astronomy and astrophysics.
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New General Catalogue
The New General Catalogue of Nebulae and Clusters of Stars (abbreviated as NGC) is a catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888.
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Niccolò Cacciatore
Niccolò Cacciatore (26 January 1770 – 28 January 1841) was an Italian astronomer.
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Palermo Astronomical Observatory
The Giuseppe S. Vaiana Astronomical Observatory is an astronomical observatory located in Palermo, Sicily, Italy, housed inside the Palazzo dei Normanni.
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Sicily
Sicily (Sicilia; Sicìlia) is the largest island in the Mediterranean Sea.
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