But MASCOT didn't "die" for nothing, as exemplified by a report published last week in Science. New analyses of the lander's photos show that Ryugu's surface is composed of two kinds of rock: bright and smooth, and dark and rough. The two types are distributed pretty evenly, too. This backs the theory that Ryugu was born from a cataclysmic event of some sort—for example, an asteroid (perhaps made up of bright, smooth stone) could have smashed into another (potentially dark and rough) object, sending debris flying. Ryugu could have been born when gravity compacted that rubble.