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2022年にDouble Asteroid Redirection Test(DART)という惑星軌道を変える実験がNASAで行われるのだけれど、そこにhayabusa2とorisis-rexの実験は不可欠って書いているね。

Bridenstine also pointed to two ongoing asteroid missions, the Japanese Hayabusa2 spacecraft visiting Ryugu and NASA's own OSIRIS-REx probe at Bennu. Both are science missions; NASA's first-ever planetary defense mission will be the Double Asteroid Redirection Test, or DART, scheduled to launch in 2022. But Bridenstine argued that both Hayabusa2 and OSIRIS-REx will still provide vital information and proof-of-concept for planetary defense work merely by conducting science work.

"So, that's why we do those missions," he said. "Yes, it's about science, it's about discovery, it's about exploration, but one of the reasons we do those missions is so that we can characterize those objects to protect, again, the only planet we know to host life."