Perseverance has collected four rock samples from an ancient river delta where organisms might have thrived.
One pair comes from a rock outcrop known as Skinner Ridge, which is made of fine-grained sandstone similar to a type of rock seen in many places on Earth. Viewed up close in Perseverance’s sampling tubes, the Skinner Ridge cores appear light-coloured and studded with round grains of dark material. These darker grains were probably carried by the ancient river that once flowed into Jezero from regions that lie perhaps hundreds of kilometres away.
The other recently collected pair of cores comes from a spot called Wildcat Ridge, which lies just 20 metres from Skinner Ridge. These samples are lighter in colour, and are more homogeneous. They seem to be a mudstone — even more fine-grained than the Skinner Ridge cores. The finer the grains in a rock, the more likely it is to contain evidence of past life.
The rover examined sedimentary rock at Skinner Ridge and Wildcat Ridge by grinding circular patches. The Skinner Ridge rock contained dark grains, while the Wildcat Ridge patch was lighter in colour and had finer grains.Wildcat Ridge is also where scientists spotted the organic molecules. Next to the sites from which Perseverance drilled its two cores, the rover ground a 5-centimetre-wide circle into the rock to expose its interior texture.
It turned out to be richer in organics than any spot studied by Perseverance so far, said Sunanda Sharma, a planetary scientist at the Jet Propulsion Laboratory. And the organics seem to be most concentrated in spots that are also rich in sulfate minerals, which can harbour signs of life. This suggests that organics and sulfate minerals were concentrated as the lake that once filled Jezero was evaporating, Sharma said.
Perseverance’s sidekick, the miniature helicopter Ingenuity, has lasted much longer than its designers ever thought it would. It recently made its 31st flight, having been designed for only five. Ingenuity
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