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Vznik a vývoj vesmíru

Space Science - Science

Vznik a vývoj vesmíru, kosmické objekty

What's your Age in Venus?

Space Science - Science

Register your age on a different planet.

Multiply your age by 365 and the result is divided by the amount of days 1 year on the planet you want to know has.

Evaluación del planeta tierra

Space Science - Science

Evaluación del planeta tierra

El Universo

Space Science - Science

ejercicios del universo