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Discover the COSMOS (Astro-photo of the Day)

4.75
Average: 4.8 (8 votes)
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History of Sunspot Observations

5
Average: 5 (7 votes)
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The Sunspot Cycle

4
Average: 4 (2 votes)
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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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Paino vs massa

3
Average: 3 (1 vote)
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Galaxies

0
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Planetary Nebulae

0
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Globular Clusters

0
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The Hertzsprung Russel (HR) diagram

0
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