NASA’s OSIRIS-REx Spacecraft Collects Significant Amount of Asteroid Two days after touching down on asteroid Bennu, NASA’s OSIRIS-REx mission team received on Thursday, Oct. 22, images that confirm the spacecraft has collected more than enough material to meet one of its main mission requirements - acquiring at least 2 ounces (60 grams) of the asteroid’s surface material. http://www.nasa.gov/press-release/nasa-s-osiris-rex-spacecraft-collects-significant-amount-of-asteroid