if the earth is spherical then rockets can use less energy to get to outer space by flying horizontally till they reach outer space or even they can nose dive and enter outer space from beneath the earth.
It simply is because in vertical direction you can leave the region of dense air pressure.
wolfgang konie thanks alot. i just drew two circles at right angles and the difference is not clear in terms of the air mass because from the inner circle to the outer one looks similar. could there be another reason?
Elias Mjaika Ndifon "could there be another reason?"
Space missions require a very high speed relative to earth. Air drag therefor is extremely dominant.
But there is one possibility to save energy. It could be feasible to transport a rocket with a giant plane nearly horizontally to a considerable elevation and begin there with the rocket operation.
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