Rockets that is launched have a at least 7.6 kilometre per second (4.9 miles per second in order to reach space, Or more than 20 times the speed of sound is necessary to get into space.
Tag: rocket
The obvious reason is the capacity of rocket. Since we use conventional chemical propulsion system , even in space we relies on solar power & chemical power for our spacecrafts. Thus it requires huge amount of fuel to go directly to moon against the gravity of earth and of course sun. But in orbital motion , we are assisted by the same gravity to boost our craft speed to such level to be able to the moon.
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