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Hur kan jordklotets rotation observeras?

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Der Mond

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Die internationale Raumstation

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Der Sternenhimmel im Winter

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Einige Objekte in unserem Sonnensystem

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Which one can rise higher, a toy balloon or a hot air balloon?

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Weight in the Moon

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Moonwalk in Heureka

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Γιατί ένας δορυφόρος δεν μπορεί να ταξιδέψει χωρίς ηλεκτρισμό;

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Σκοτεινή Ύλη

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