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The Hertzsprung-Russell diagram

author: P.Carril/Novapix

reference: a-eto99-99000

Comet 17P/Holmes with California nebula

author: Sebastian Voltmer/Novapix

reference: a-com21-02046

Mercury by Messenger- Jan 14 2008

author: Nasa/JHUAPL/ Carnegie Institution of Washington/Novapix

reference: a-mer04-00009

Swope telescope - Las Campanas Observatory

author: S.Numazawa/APB/Novapix

reference: o-lca01-01003

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2020-09-03 Comet Neowise - The Great Comet of 2020
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Fred Espenak
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