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![Riding atop a SpaceX Falcon 9 rocket, NASA’s Double Asteroid Redirection Test, or DART, spacecraft sets off to collide with an asteroid in the world’s first full-scale planetary defense test mission in November 2021.](https://www.popsci.com/wp-content/uploads/2024/05/spacex-lauch.jpg?w=800)
Private Space Flight
A rare risk of asteroid fastballs turns scientists into sluggers A rare risk of asteroid fastballs turns scientists into sluggers
By Theo Nicitopoulos / Undark
May 20, 2024