Hayabusa returns first asteroid sample (2010)
Japan's Hayabusa probe touched asteroid Itokawa and, despite fuel leaks and lost contact, limped home. Its capsule landed in the Australian outback carrying about 1,500 tiny grains of rock.
It was the first spacecraft to return material from an asteroid, though far less than planned.
The grains proved space rocks feed meteorites on Earth and set the template for later sample missions.
It shows both the payoff and the fragility of asteroid sampling, the exact challenge Tianwen-2 now faces.
