NASA probe reaches asteroid to collect samples after flying 2bn km
NASA's OSIRIS-REx has arrived at asteroid Bennu after flying over 2 billion kilometres in over two years. OSIRIS-REx was launched to collect rock samples from Bennu and return to Earth by 2023 for study. The spacecraft will spend over a year mapping the asteroid to select a sample site. After collection it will head back for Earth in 2021.