Aktiviteler: Evren
Constellations
Zorluk: ★
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Astronomy softwares
Zorluk: ★
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Astropuzzle
Zorluk: ★
Birthday stars
Zorluk: ★
The search for extraterrestrial intelligence
Zorluk: ★
Invent an alien
Zorluk: ★
Micro and macrocosmos
Zorluk: ★
Making a constellation slide
Zorluk: ★