China's ambitious Tianwen-2 mission will soon be heading to two extremely different space rocks, and should provide vital data to help us understand the nature of asteroids and comets The Tianwen-2 mission by the China National Space Administration (CNSA) will collect a 100-gram sample from the asteroid Kamoʻoalewa and return it to Earth. But it will be China’s first mission to an asteroid involving the return of a rock sample, and it is likely to be the first mission to a unique type of body called a quasi-satellite.