Study Reveals that NASA Spacecraft Sent to Smash Into Asteroid Successfully Diverted Its Course, In Win for Future Missions to Nudge Space Rocks in Collision Course With Earth
Survival of humanity may one day depend on that capability to change asteroids’ courses.
Out of the many apocalyptic scenarios for the world and its inhabitants, probably no one is so frightening – and in a way, inevitable – than the possibility of a collision of a wandering space rock with our planet.
It’s been the object of both science and fiction to imagine space missions to divert these civilization-killers from their collision courses.
And, as it turns out, a first experimental mission has been successful in doing so.
Four years ago, NASA purposely smashed a spacecraft into a small asteroid to see if they could deflect it — a test to prove humanity could protect Earth from threatening space rocks. New research out Friday says the experiment pushed the moonlet asteroid slightly off course… pic.twitter.com/5kraEEvhY8
— AFP News Agency (@AFP) March 6, 2026
Associated Press reported:
“It’s the first time that a celestial body’s orbit around the sun was deliberately changed. The asteroid that NASA’s Dart spacecraft slammed into was never a threat to Earth.
‘This study marks a notable step forward in our ability to prevent future asteroid impacts on Earth’, the international research team wrote in Science Advances.
The changes were slight — reductions of just one-tenth of a second and one-half of a mile (720 meters) to a solar lap spanning two years and hundreds of millions of miles (kilometers), according to the scientists.”
This isn’t science fiction. A NASA mission successfully changed the orbit of an asteroid system. https://t.co/MJzqi7qRlK
— The Wall Street Journal (@WSJ) March 6, 2026
“’Even though this seems small, a tiny deflection … can add up over decades and make the difference between a potentially hazardous asteroid hitting or missing the Earth in the future’, lead author Rahil Makadia, of the University of Illinois Urbana-Champaign, said in an email.”
Having an impact on the effort to protect Earth: In 2022, NASA’s DART mission tested a technique for deflecting a hazardous asteroid by impacting tiny Dimorphos. Now, new research reveals that DART also changed the orbit of its larger companion, Didymos. https://t.co/ykuNEtL98V pic.twitter.com/4VVcOU5jdf
— NASA Solar System (@NASASolarSystem) March 6, 2026
Ars Technica reported:
“The pure kinetic energy of a 500-kilogram spacecraft hitting at hypersonic speeds is impressive, but on its own, it would not slow a huge asteroid that much. When DART struck Dimorphos, it blasted pulverized rock and dust out into the void. ‘The material kicked up off an asteroid’s surface acts like an extra rocket plume’, Makadia said.
Scientists call this effect the momentum enhancement factor, denoted by the Greek letter beta. If the spacecraft impact transferred exactly its own momentum and no debris was kicked up, beta would be exactly one.
Because Dimorphos orbits Didymos, some of the ejecta remained trapped in the system, where it altered the mutual orbit between the two rocks. But a crucial fraction of the ejecta achieved escape velocity from the entire binary system. The momentum carried away by the system-escaping debris is what ultimately contributed to shoving the center of mass of the whole Didymos-Dimorphos pair. ‘In our case, we found that the beta parameter due to DART impact was around two’, Makadia explained.”
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