User:Learnerktm
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An amateur 20 cm (8 inch) Ritchey–Chrétien telescope on a strain wave mount images a mosaic of the Pleiades (not visible), briefly pauses, then images a mosaic of the Orion Nebula under dark skies of the York Prairie State Natural Area, Wisconsin, USA.
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- Category:Featured sounds on Wikipedia, English - Category:Featured sounds on Wikipedia, Spanish - Category:Featured sounds on Wikimedia Commons
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- Cheong-chun-gye-geup
- jeonhwa ilgi
- Oppaneun punggakjaeng-i
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- Category:Videos of sciences
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- Category:Flipped classroom videos by subject