TAG_Spacecraft close.jpg

Artist's impression of the OSIRIS-REx spacecraft's sampling arm sinking into the asteroid's surface NASA’s Goddard Space Flight Center/CI Lab/Jonathan North Big surprise: When OSIRIS-REx swooped in to grab a sample of material from Bennu, its sampling arm sank right into the ground, depicted in this artist’s impression. The particles making up Bennu's exterior are so loosely packed and lightly bound to each other that they act more like a fluid than a solid, according to research papers detailing the event.