Very difficult


Die Sonne

0
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Harmonices Mundi

0
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Keplersche Fassregel

0
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Ατμοσφαιρική Απορρόφηση

3.666665
Average: 3.7 (3 votes)
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Light at Night Co-distributes with Incident Breast but not Lung Cancer in the Female Population of Israel (Article)

0
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Weblink: Sun, Moon & Earth Applet

3
Average: 3 (1 vote)
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Stellar Spectra: Temperature

0
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Stellar Spectra Classification

4.75
Average: 4.8 (4 votes)
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Galaxies

0
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Planetary Nebulae

0
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