Tekuo, astronomy and hard sums

My study area lies on Tekuo, an Earth-like planet inhabited by sentient hominids. Tekuo is one of seven planets orbiting a class G2 sun, known as Ayu. The first four planets in the system are rocky. Tekuo is the third of these. Three gas giants lie in the outer part of the system. Tekuo is the only planet in the system to lie in the habitable zone.

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