Probe uses Earth's gravity to change velocity by 13,600 kmph
NASA's Sun-orbiting spacecraft has used Earth's gravity as a slingshot to accelerate towards Asteroid Bennu, resulting in a velocity change of 13,600 kmph. The OSIRIS-REx spacecraft is on a seven-year mission to study and return a sample of Bennu to Earth. The samples will help scientists understand the formation of Solar System about 4.5 billion years ago, said NASA.