NASA’s spacecraft OSIRIS-REx has finally reached the asteroid 101955 Bennu – which may be on collision course with the Earth – after traveling for just over two years since its launch in September 2016. This mission, which will bring grains back for us to study on Earth, is latest to return asteroid samples to Earth after the Japanese Space Agency’s missions Hayabusa 1 and 2 and StarDust. The data will help unveil more about the origins of the solar system and how to protect the Earth from possible asteroid impact. The spacecraft will spend the next year completing a detailed…

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