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NASA knocked an asteroid off course in 2022 in a pioneering test of humanity's ability to defend Earth. Its spacecraft's impact pushed the space rock into a slightly different orbit around the Sun, according to new research published Friday.
Issued on: 07/03/2026 - 16:10Modified: 07/03/2026 - 16:16
By: FRANCE 24 A handout photograph taken on December 19, 2022 shows an image of the asteroid Dimorphos nearly four months after it was impacted by NASA’s DART mission. © Space Telescope Science Institute, ESA, NASA handout via AFP 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.
The experiment pushed the moonlet asteroid Dimorphos into a smaller, faster route around its sibling Didymos – and according to new research out Friday, it also pushed the pair into a slightly different orbit around the Sun.
The test on Dimorphos was never based on any actual threat to our planet.
But the successful experiment and additional analysis offers a solid data point to mount a defence if any such eventual threat is detected, researchers said.
Dimorphos' egg-like shape and craggy, boulder-dotted surface came into clear view in the last few moments before DART's impact. © NASA, Jons Hopkins APL handout via AFP "This study marks a notable step forward in our ability to prevent future asteroid impacts on Earth," the team of international researchers wrote in their new paper published in the journal Science Advances.
Their observations detailed in the paper showed that the Double Asteroid Redirection Test (DART) in 2022 marked "the first time a human-made object has measurably altered the path of a celestial body around the Sun", NASA said in a statement.
Rahil Makadia, the study's lead author, said his team tracked stellar occultations – the moment when an asteroid passes in front of a star, causing a brief dimming for less than a second – to obtain hyper-precise measurements of the asteroid's position, speed and shape.
Obtaining this data is no small feat. The team relied on volunteer astronomers from around the globe, who recorded 22 of these stellar occultations.
Using that data along with years of additional observations, Makadia said the team was able to measure Didymos's orbit around the sun with precision.
"We were able to measure what this change was exactly," he said, and make computations that could assist with future "planetary defense efforts".
Read moreHow Earth can defend itself against 'city killer' asteroid
The orbital change was miniscule – just 0.15 seconds.
But it's enough to make a difference, scientists say.
"This is a tiny change to the orbit, but given enough time, even a tiny change can grow to a significant deflection," said Thomas Statler, lead scientist for solar system small bodies at NASA Headquarters in Washington, in a statement.
"The team's amazingly precise measurement again validates kinetic impact as a technique for defending Earth against asteroid hazards and shows how a binary asteroid might be deflected by impacting just one member of the pair."
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