The lead guitarist of Queen put his astrophysics PhD to real use. NASA's OSIRIS-REx probe reached asteroid Bennu and found a chaotic boulder field - nothing like what scientists had planned for. For nearly two years, the team wasn't sure they could land safely. Brian May joined the science team as an invited collaborator. He used 3D stereoscopic imaging to read the surface and pinpoint a safe site. He helped NASA grab a piece of the asteroid.