![]() ![]() However, while these methods of deflection should work for smaller, Dimorphos-scale asteroids, shifting larger asteroids will require a bigger punch. ![]() “There are lots of ideas out there,” Johnson said. Or solar reflectors placed on the surface of an asteroid could use sunlight to push the space rock away. Firing an ion engine, the tractor would in theory be able to pull the asteroid away from a collision course with Earth.Īlternatively, the thrust from an ion engine could also nudge a small asteroid away from Earth. The spacecraft, though small compared to the asteroid, would have enough gravity to pull the asteroid toward it. A gravity tractor involves parking a large spacecraft next to an asteroid. “We’ll certainly look to do tests in the future, whether it’s against a different type of asteroid, or to test another technique, such as a gravity tractor,” Johnson said. Should DART prove successful, planetary scientists view it as just the beginning of our efforts to learn how to defend Earth from hazardous asteroids. That evolved into two independent but connected missions: DART and the European Space Agency’s Hera mission, which will follow up on DART, visiting Didymos and Dimorphos in 2026 to view the aftermath of the impact and conduct a scientific study of the double-asteroid system. Although that particular mission never came to pass, in 2011, representatives from NASA and ESA discussed a potential joint deflection mission called AIM (Asteroid Impact Mission). “DART is just a first test in what we see as an ongoing program.”ĭART’s roots go back 20 years, to when scientists at the European Space Agency considered a kinetic impactor mission called ‘Don Quijote’ (named after the eponymous knight in the famous Spanish novel). “Our charter from the beginning has been not only to find asteroids, but to work on the technology and techniques that can be used to deflect an asteroid from an impact trajectory, should we ever find one,” he told. However, according to Lindley Johnson, the director of NASA’s Planetary Defense Coordination Office, the DART mission does not signify a change in policy of thinking about hazardous objects, but rather a continuation of the work done so far. The experiment marks a change of pace for NASA, which has to date focused its spacecraft on science. DART’s so-called “ kinetic impact” will alter Dimorphos’ orbit around Didymos, and because the two rocks are gravitationally bound, there’s no chance that the impact could send Dimorphos accidentally careening across space. 26.ĭimorphos is a member of a binary system with another asteroid, the 2,600-foot-wide (780 m) Didymos, making it the ideal target with which to measure our deflection capabilities. ![]() ![]() One technique is brute force, and to test it, DART will collide with the 560-foot-wide (170 m) Dimorphos at 7:14 p.m. And as astronomers discover near-Earth asteroids in ever greater numbers, attention is now turning toward how we might protect Earth should an asteroid on a collision course be discovered. When NASA’s Double Asteroid Redirection Test (DART) slams into the tiny asteroid Dimorphos, it will be our first attempt to demonstrate our ability to deflect dangerous incoming asteroids.įor decades, scientists around the world have been scanning the sky, searching for potentially hazardous asteroids in the vicinity of Earth. ![]()
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