Images from the surface of asteroid Ryugu show rocks similar to carbonaceous chondrite meteorites

The near-Earth asteroid(162173) Ryugu is a 900-m-diameter dark object expected to contain primordial material from the solar nebula. The Mobile AsteroidSurface Scout ( MASCOT) landed on Ryugu’s surface on 3 October 2018. We present images from the MASCOTcamera (MASCam) taken during the descent and while on the surface. The surface is covered by decimeter- to meter-sized rocks, with no deposits of fine-grained material. Rocks appear either bright, with smooth faces and sharp edges, or dark, with a cauliflower-like, crumbly surface. Close-upimages of a rock of the latter type reveal a dark matrix with small, bright, spectrally different inclusions, implying that it did not experience extensive aqueous alteration. The inclusions appear similar to those in carbonaceous chondritemeteorites.