Far from Earth, a small European spacecraft has begun to study the place where humanity first deliberately tried to bend an asteroid's path. Years after NASA's DART probe struck the moonlet Dimorphos in 2022, the European Space Agency's Hera now hangs some 25 to 30 kilometers away, examining the wreckage of that experiment with patient care. The inquiry matters because it tests whether a collision can truly nudge a rock from its course, a question that concerns the whole planet even though none of these bodies threatened it. Here, in the quiet of the solar system, a small act of ambition is be
Europe's Hera Begins Close Inspection of Asteroid Moon Hit by NASA's DART Test
A crash site investigation worthy of its finest robotic detective
Mark
Why send a second spacecraft four years after the crash?
Mimi
DART showed the orbit changed, but it was a fast, one-way visit. Hera is the follow-up, studying the site at length with 25 instruments.
Mark
What actually changed for Dimorphos?
Mimi
Its orbit around Didymos got shorter, and it also moved onto a slightly different path around the sun.
Luke
Worth noting that the path change is reported as slight. The source gives no figure for it.
Mark
And the debris?
Mimi
Rubble and boulders flew off, adding extra kick. The trail reached more than 10,000 kilometers and lasted months.
Luke
Some of it may still be nearby, according to scientists. That is a possibility, not a confirmed observation.
Mark
What comes next?
Mimi
Hera goes to 20 kilometers next month, and the CubeSats try to survey Dimorphos and land on it.
Luke
Attempt is the key word. A landing is a goal, not a result yet.
Le Pouls
- A deliberate crash into an asteroid in 2022 has left a debris trail stretching thousands of miles, and some of it may still be drifting nearby.
- Hera, a car-sized European spacecraft carrying 25 instruments, has begun its close survey as investigators hunt for the details of what the impact really did.
- The mission's central question is whether a kinetic strike can shift an asteroid's path around the sun, a result DART already hinted at by altering Dimorphos's orbit.
- Hera is preparing to move in to about 20 kilometers next month, while two shoebox-sized CubeSats are readied to survey Dimorphos up close and attempt a landing.
Far from Earth, a small European spacecraft has begun to study the place where humanity first deliberately tried to bend an asteroid's path. Years after NASA's DART probe struck the moonlet Dimorphos in 2022, the European Space Agency's Hera now hangs some 25 to 30 kilometers away, examining the wreckage of that experiment with patient care. The inquiry matters because it tests whether a collision can truly nudge a rock from its course, a question that concerns the whole planet even though none of these bodies threatened it. Here, in the quiet of the solar system, a small act of ambition is being examined for what it teaches about protecting the future.
The European Space Agency has announced that its Hera spacecraft has started close inspections of the asteroid Didymos and its small moon, Dimorphos. Hera is watching the pair from 25 to 30 kilometers away, the first detailed look at the site since NASA crashed its DART probe into the moonlet in 2022.
DART was a test, not a rescue. No asteroid threatened Earth. Engineers wanted to learn whether a deliberate collision could one day help turn aside a dangerous rock. The impact shortened Dimorphos's orbit around Didymos and, more importantly, nudged the moonlet onto a slightly different path around the sun, proof that a strike can change an asteroid's course.
The collision also hurled rubble and boulders into space, adding momentum beyond the spacecraft's own. That debris trail reached more than 10,000 kilometers and lingered for months, and some of it may still be nearby.
Hera, about the size of a car, launched in 2024 and carries 25 instruments plus two shoebox-sized CubeSats. Officials call the mission a crash site investigation. Next month Hera will close to about 20 kilometers, and the CubeSats will attempt to survey Dimorphos even more closely and land on it, filling in what the experiment actually did.
The European Space Agency announced on Wednesday that its Hera spacecraft has started close inspections of the asteroid Didymos and its small moon, Dimorphos. Hera is now watching the pair from a distance of 15 to 18 miles (25 to 30 kilometers).
Dimorphos is the object NASA hit on purpose in 2022. The American spacecraft, called DART, short for Double Asteroid Redirection Test, was sent to crash into the moonlet to learn whether a deliberate collision could one day help protect Earth from a dangerous asteroid. Neither body posed any threat to the planet; the point was the experiment.
The impact changed the moonlet's orbit around Didymos, making it shorter. More significantly, it nudged Dimorphos onto a slightly different path around the sun. That second result is the one that matters most for planetary defense, since it shows a collision can shift an asteroid's course.
The crash also threw material off the moonlet. Rubble and even boulders flew from Dimorphos, adding an extra push beyond the momentum of the spacecraft itself. The resulting debris trail stretched more than 10,000 kilometers, or thousands of miles, into space and persisted for months. Scientists say some of that debris could still be in the area.
The two bodies are very different in size. Dimorphos is estimated at about 500 feet (151 meters) across, while Didymos measures roughly 2,560 feet (780 meters).
Hera is a small spacecraft, about the size of a car, and launched in 2024. European Space Agency officials describe the mission as a "crash site investigation" and see Hera as their finest robotic detective for the job. It carries 25 science instruments, along with two shoebox-sized CubeSats.
Next month, Hera will move closer, to just 12 miles (20 kilometers) from the asteroids. The CubeSats are meant to survey Dimorphos from even nearer and to attempt a landing on it. What they find there will fill in the details of what NASA's test actually did to the moonlet.
Citations marquantes
ESA officials consider the mission a 'crash site investigation.'— European Space Agency officials, via AP
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