NASA's OSIRIS-REx mission will leave asteroid Bennu TODAY
OSIRIS-REx launched in 2016, landing on Bennu in 2018 and returning in 2023 The craft took off from the asteroid successfully and is heading back to Earth It collected 2.1 ounces of rock and dust from the surface of the large asteroid These samples will be dropped in the Utah desert for scientists to study NASA scientists say the rocks should help reveal secrets of the early solar system as asteroids such as Bennu formed alongside planets like the Earth