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NASA’s planetary defense mission will test asteroid deflection, but how realistic could it be?

boxy spacecraft flies toward space rock

An artist’s depiction of the DART spacecraft flying toward (Image credit: NASA/JHUAPL/Steve Gribben)

On Sept. 26, NASA will crash a spacecraft into an asteroid to disrupt its path. The area rock isn’t predicted to collide with Earth, nor is any known asteroid or large object. The impact is really a test the crux of NASA’s Double Asteroid Redirection Test (DART) mission. Though there is absolutely no true impending collision, the DART mission closely mimics what NASA scientists would do if an asteroid were headed toward Earth. The mission may also give scientists valuable data which will better prepare them to redirect a big asteroid or comet if one were to head toward us.

“It really is exactly the sort of mission that people would use to really deflect an asteroid,” Seth Jacobson, an assistant professor of planetary sciences at Michigan State University and a co-investigator on the mission, told

The DART mission is specifically testing a way called the kinetic deflector technique basically, crashing a spacecraft into an asteroid to attempt to deflect or redirect its path from Earth. Its target may be the moonlet Dimorphos, which orbits the bigger asteroid Didymos. With a diameter of 525 feet (160 meters), Dimorphos is strictly how big is an asteroid that scientists really would make an effort to redirect with a kinetic impactor, Jacobson said, because the asteroid will be large enough that easy evacuation measures wouldn’t fit the bill, but small enough a moving object alone could probably deflect it. The strategy will be especially useful, he said, if we’d heard bout the impact significantly less than several decades before it could happen.

Related: NASA’s DART asteroid-impact mission is a key test of planetary defense

Though an object how big is Dimorphos would cause major damage if it were going to Earth, it likely wouldn’t be considered a danger to the complete planet. For comparison, the asteroid Chicxulub, which triggered the extinction of the nonavian dinosaurs, was about 6 miles (10 km) in diameter. To deflect anything near that size, we’d require a nuclear bomb or another powerful explosive mounted on the kinetic impactor, Jacobson said. We’d also require a large amount of time, ideally many decades, to build up this type of missile, he said. But despite having this type of large object, the essential idea is equivalent to the main one behind DART: transferring momentum to the thing by crashing something involved with it and redirecting it.

“We should understand why technique first, before you can imagine adding an explosive component,” Jacobson said.

The mission also demonstrates the higher level of international collaboration had a need to plan and execute a kinetic impact with a near-Earth object. Although mission is led by NASA and the Johns Hopkins University Applied Physics Laboratory, scientists and engineers from all around the globe are adding to DART for instance, by calculating Dimorphos’ precise orbit around Didymos and measuring the mission’s success.

“We’ve worked really closely with this European colleagues and colleagues all around the globe,” Ellen Howell, a senior research scientist at the University of Arizona Lunar and Planetary Laboratory and a co-investigator for DART, told Though DART is really a test, an identical degree of international cooperation will be essential regarding a genuine impact, she said.

Needless to say, there are many key differences between DART and a defense against a genuine asteroid impact. The largest is that neither asteroid in the chosen system is predicted going to Earth. Scientists find the Didymos system since it is really a so-called eclipsing binary when viewed from Earth quite simply, Dimorphos visibly passes before Didymos, dimming it. This dimming allows scientists to measure the way in which long it requires small asteroid to orbit the bigger one also to measure just how much that point period changes after the DART spacecraft collides with Dimorphos. Scientists use this information to understand just how much momentum the spacecraft transfers to the asteroid, that is information that’ll be crucial if we ever should utilize this technique, Jacobson said.

Furthermore, a genuine target would almost not at all participate a binary system, Howell said, as hardly any asteroids are. Plus, the chance of any object this size or larger impacting Earth soon is incredibly small. NASA says theres nothing to be worried about for at the very least another century.

Nonetheless, NASA’s Planetary Defense Coordination Office takes the chance of near-Earth-object impact very seriously exactly the same way lots of people study and make an effort to mitigate the consequences of earthquakes, tsunamis and volcanic eruptions, Jacobson said.

“They are all things which are natural hazards,” he said. “When you can’t ever completely eliminate chance for them happening, it is possible to definitely mitigate their impact and try to steer clear of the worst-case scenario.”

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Rebecca Sohn is really a freelance science writer. She writes in regards to a selection of science, health insurance and environmental topics, and it is thinking about how science impacts people’s lives. She’s been an intern at CalMatters and STAT, and a science fellow at Mashable. Rebecca, a native of the Boston area, studied English literature and minored in music at Skidmore College in Upstate NY and later studied science journalism at NY University.

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