How Did the Galileo Spacecraft Use the Earth Gravity Assist Maneuver to Reach Jupiter and its Moons?
The spacecraft Galileo did not get this lift for free, but took some kinetic energy from the earth, just a trace. First of all, the gravity-assist phenomenon does not occur as something between the spacecraft and earth alone. Galileo did not come from infinity and fall away from the earth to infinity. Both are just parts of the