Rise of nationalism in Europe Summary

Moon is bigger than earth 

Isn’t it funny to read this but this is the fact.Nobody has gone to moon yet.It is difficult to cross the radiation belts that might cause people to burn.The moon causes high tides and low tides on the earth.Why this happens?If the mass of earth is greater how could it happen? May be it’s like one of those explanations related to the colour of sky during dawn,dusk and noon.It seems to be simply ridiculous.The sea looks exactly the same colour when satellites took photos from the space surrounding earth .Then why does the sky change its colour?