Check the listing for details. FALCON 9 DART NASA SPACE MISSION PATCH first foray into active planetary defense. Condition: New. Listed at 4.00 USD. FALCON 9 DART NASA SPACE MISSION PATCH first foray into active planetary defense Known as the Double Asteroid Redirection Test (DART), is NASA's first foray into active planetary defense. Planetary defense seeks to detect large asteroids that could potentially collide with Earth, evaluate the risk these rocks pose and, if need be, attempt to avert calamity. DART will test one technique for that last step by slamming into the smaller moon of an asteroid while humans watch closely to see how much the moon's orbital period shortens. You would just give this asteroid a small nudge, which would add up to a big change in its future position, and then the asteroid and the Earth wouldn't be on the collision course. FALCON 9 DART NASA SPACE MISSION PATCH first foray into active planetary defense Track Page Views With Auctiva's FREE Counter