A mosaic image of asteroid Bennu composed of images collected by the OSIRIS-REx spacecraftNASA/Goddard/University of ArizonaThe asteroid Bennu is puzzling scientists, with samples from the space rock showing weirder properties than they expected. These include extremely high nitrogen levels and improbably magnetic properties.Scientists have been analysing clumps of rock from Bennu since NASAs OSIRIS-REx spacecraft returned samples from the asteroid to Earth in 2023. They quickly found these contained a plethora of the chemical building blocks for life, including particles