Gravity Assist Maneuver for getting high speed

Acceleration by gravity 

Sling shot is common toy used by every kid in early childhood days but have you ever thought that the same principle can be used to attain a speed of 100thousand miles an hour. Yes this is true somewhere in the early 1960s a scientific thought of accelerating the space shuttle by using gravity as sling shot and this technique is know as the Sling Shot acceleration , Gravity Assist Maneuver. Marine 10 was the first space probe to use gravity assist and the latest is India's Mangalyan which orbited earth for one month before departuring.
This is a simple technique which uses gravity to increase the speed by orbiting the space craft around a planet ( know how to make something orbit click herehttp://imparallel.blogspot.mx/2015/01/getting-things-into-orbit.html?m=1) every time it is attracted by gravity it's speed increase and when it is faced towards sun the sun's gravity attract it and by going a series of these repeated procedures certain amount of speed can be obtained and when it escapes the gravitational pull of a planet the space craft gets accelerated in the same manner when you rotates a stone tied to a rope and suddenly release it. The centripetal force rotates the space craft and gravity attract it but when gravity is gone the rotatory motion geto converted into linear motion. Rosseta is an iconic example of a perfect Gravity Assist Maneuver it has to travel 1billion kilometers to reach its destination which is also traveling at a speed of 55000kmph so to match this speed it orbited three times on earth and one time in mars so the speed can be achieved.
This method is not very costly but a lot of time consuming, fuel payload can be kept minimum using this technique as gravity does the most of the work and higher the gravity higher will be the speed obtained.