The camera pointed at the horizon and waited.
At a spot on the western rim of Jezero Crater called Witch Hazel Hill, a rover was watching the dusty air.
Then four twisters turned up in one scene, and the biggest one absorbed a neighbor.
The whole encounter was recorded from about six tenths of a mile away.
What a Martian dust devil is actually doing to the one beside it
A Martian dust devil starts with sunlight. Air near the surface is heated by contact with the warmer ground and rises through the denser, cooler air above it, and as other air moves along the surface to fill that gap, it begins to rotate. The incoming air speeds up as it rises into the column, like a skater pulling in their arms, and it picks up dust as it goes.
Mark Lemmon, a Perseverance scientist at the Space Science Institute in Boulder, Colorado, put it bluntly: “Convective vortices can be rather fiendish.” He added that these spinning columns wander the surface picking up dust and lowering visibility, and that if two happen upon each other they can either obliterate one another or merge, with the stronger consuming the weaker.
That second outcome is what the rover’s camera caught. The caveat sits inside Lemmon’s own wording: a meeting between two competing vortices has no single fixed result, and mutual destruction is on the menu alongside a merger. Nothing in this footage settles which way the next encounter will go.
The scene at Witch Hazel Hill, measured in feet
From about 0.6 miles away, the larger dust devil was approximately 210 feet wide, at least 1,300 feet tall, and moving about 2 mph to the west northwest. The smaller column trailing behind was roughly 16 feet wide and traveling a little faster as it was sucked into the larger whirlwind.
Two other dust devils can also be seen in the background, at left and center, which puts four separate columns in a single scene. That crowding says something about how ordinary these whirlwinds are on an afternoon at the crater rim.
Then the wide column overtook the narrow one and pulled it apart. The sequence plays out over roughly two minutes of real Martian time, though the released clip is compressed and sped up.
Why the team had been watching this ridge for months
The rover first looked over the rim of Jezero Crater in December 2024 and spent the following months working across Witch Hazel Hill. It captured new images of multiple dust devils there in January 2025, and the smaller devil’s demise was recorded during an imaging experiment the science team designed to better understand forces at play in the Martian atmosphere.
The video from that session was built from 21 frames taken about six seconds apart and sped up 30 times. Katie Stack Morgan, project scientist for the mission, has said dust devils are responsible for roughly half the dust in the Martian atmosphere, which is why a curiosity earns dedicated camera time.
The size record belongs elsewhere. An orbiter image from more than a decade ago caught a dust devil roughly 12 miles high in the Amazonis Planitia region of northern Mars, though that plume was little more than three quarters of a football field wide. That towering column dwarfs the crater rim pair in height, not in width.
How this fits into what the rover is doing at Jezero
Perseverance’s mission centers on astrobiology and the search for signs of ancient microbial life, along with characterizing the planet’s geology and past climate and caching rock and regolith samples. The climb to the rim opened a new phase, and that imaging session shows atmospheric science running alongside the drilling.
The dust data collected here matters because these vortices track conditions such as prevailing wind direction and speed, and because they move so much of the dust that settles on the planet and on the hardware sent there. In May, a dust devil photobombed a rover selfie marking its 1,500th sol while the machine was parked at Witch Hazel Hill, about 3 miles north of Neretva Vallis.
The situation echoes the challenge facing volcanic field crews: the instrument has to be pointed the right way at the right moment. The same lesson runs through weather readings rescued from old ships’ logbooks, where the worth of an observation depends on who was looking, and where, and when.
What this record means and what the team still cannot predict
The hardest fact here is also the simplest: a Jezero Crater dust devil absorbed a column about thirteen times narrower than itself and kept drifting at roughly walking pace. The ratio of 210 feet to 16 feet is the measured scale of that mismatch.
What the team cannot do is say when the next merger will happen. Capturing a dust devil with a spacecraft takes some luck, and because scientists cannot predict when they will appear, Perseverance routinely monitors in all directions. The camera was simply running the right way.
Even so, sustained horizon watching from the rim keeps producing atmospheric measurements that an orbiter pass cannot match, and the monitoring has continued. The crater the rover has been methodically drilling for rock cores doubles as a working weather laboratory, and the dust turning over its floor each afternoon is part of what the mission is there to measure.
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