NASA has released a striking dawn image from its Curiosity rover, showing wind-carved cliffs on Mount Sharp in Mars’ Gale Crater, taken about an hour after sunrise.
The Mastcam view captures yardangs — streamlined ridges sculpted by wind-blown sand over immense spans of time. On Mars, where the air is thin but persistent, abrasive dust and sand act like slow sandpaper, carving rock into shapes that record the direction and power of ancient winds.
According to NASA, the layer in view may be ancient wind-blown sediment or volcanic ash that later hardened into rock. It is thought to have formed around 3 billion years ago, when Mars was losing its thicker atmosphere and much of its surface water, and it stretches for roughly 16 kilometres.
That age is what makes the picture scientifically valuable, not only beautiful. Each layer in Mount Sharp is a page in the planet’s climate history. By studying how the sediment was laid down, hardened and then eroded, scientists can test ideas about when Mars dried out and whether habitable conditions lasted long enough for life to emerge.
Curiosity has now climbed more than 1 kilometre in elevation on Mount Sharp, the most any rover has climbed on Mars, according to the mission. The ascent is deliberate: lower layers formed in wetter eras, higher layers in drier ones, so driving uphill is, in effect, driving forward through time.
The rover’s instruments continue to analyse rock chemistry and search for organic molecules preserved in the ancient sediment. Even a negative result matters, because it tells scientists where on Mars future missions — and eventually, perhaps, sample-return efforts — should look next.
Images like this dawn panorama do double duty. They are data, used to plan drives and choose drilling targets, and they are a public window onto a landscape no human has visited.
Three billion years after wind first piled this sediment into place, a machine built on Earth is climbing through it, one sunrise at a time.
