artifcial satilights

the geosynchronous orbit is diffrent from the polar orbit becaus it does not see completly around the world but the polar orbit can see completely around the world there used to map it and take picture

earth a unique planet

the earths crust is the outer layerbelow it is were the mantel is found the earths mantel is 2900 km thick.in the dead center of the earth there is the core it is solid iron . s waves do not reach the s wave shadow zonebecaus they are blockd by liquide p waves can travel all the layers

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