Binary stars


Ατμοσφαιρική Απορρόφηση

3.666665
Average: 3.7 (3 votes)
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Observations of stars and stellar systems

4.333335
Average: 4.3 (3 votes)
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Наблюдение на звезди и звездни системи

4.285715
Average: 4.3 (7 votes)
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