The process by which many space exploration satellites and probes get into deep space A space exploration satellite can enter the gravitational field of a large planetary body like the Earth or Mars, and use the force of that planet's gravity to give the satellite momentum Basically, the satellite swings around a planet and uses the energy from the planet's gravitational pull to send it into space This uses the planet's gravitational pull like a slingshot
A maneuver in which a car following the leader in a draft suddenly steers around it, breaking the vacuum; this provides an extra burst of speed that allows the second car to take the lead See "Drafting "