Low-angle self-portrait of NASAs Curiosity Mars rover. Credit: NASA/JPL-Caltech/MSSS
NASAs Curiosity Mars Rover has arrived at a special region believed to have formed as Mars climate was drying.
After trekking this summer through a narrow, sand-lined pass, NASAs Curiosity Mars rover recently arrived in the sulfate-bearing unit. This long-sought region of Mount Sharp is enriched with abundant salty minerals.
Scientists hypothesize that the minerals were left behind billions of years ago when the water dried up in streams and ponds. Assuming this hypothesis is correct, these minerals offer tantalizing clues as to how and why the Red Planets climate changed from being more Earth-like to the frozen desert it is today.
Curiositys View of Paraitepuy Pass: NASAs Curiosity Mars rover used its Mast Camera, or Mastcam, to capture this panorama while driving toward the center of this scene, an area that forms the narrow Paraitepuy Pass on Aug. 14, the 3,563rd Martian day, or sol, of the mission. Credits: NASA/JPL-Caltech/MSSS
Years before Curiosity landed in 2012, the minerals were spotted by NASAs Mars Reconnaissance Orbiter, so scientists have been waiting a long time to see this terrain up close. Soon after arriving, the rover discovered a diverse array of rock types and signs of past water, among them popcorn-textured nodules and salty minerals such as magnesium sulfate (Epsom salt is one kind), calcium sulfate (including gypsum), and sodium chloride (ordinary table salt).
They selected a rock nicknamed Canaima for the missions 36th drill sample, and choosing was no easy task. Along with scientific considerations, the team had to factor in the rover hardware. Curiosity uses a percussive, or jackhammering, rotary drill at the end of its 7-foot (2-meter) arm to pulverize rock samples for analysis. Worn brakes on the arm recently led the team to conclude that some harder rocks may require too much hammering to drill safely.
Curiositys View of Sand Ridges and Bolvar: NASAs Curiosity Mars rover used its Mast Camera, or Mastcam, to capture this panorama of a hill nicknamed Bolivar and adjacent sand ridges on August 23, the 3,572nd Martian day, or sol, of the mission. Credit: NASA/JPL-Caltech/MSSS
As we do before every drill, we brushed away the dust and then poked the top surface of Canaima with the drill. The lack of scratch marks or indentations was an indication that it may prove difficult to drill, said Curiositys new project manager, Kathya Zamora-Garcia of NASAs Jet Propulsion Laboratory in Southern California. We paused to consider whether that posed any risk to our arm. With the new drilling algorithm, created to minimize the use of percussion, we felt comfortable collecting a sample of Canaima. As it turned out, no percussion was needed.
The missions scientists look forward to analyzing portions of the sample with the Chemical and Mineralogy instrument (CheMin) and the Sample Analysis at Mars instrument (SAM).
The journey to the sulfate-rich region took Curiosity through treacherous terrain, including, this past August, the sandy Paraitepuy Pass, which snakes between high hills. It took the rover more than a month to safely navigate in order to finally reach its destination.
While sharp rocks can damage Curiositys wheels (which have plenty of life left in them), sand can be just as hazardous, potentially causing the rover to get stuck if the wheels lose traction. Rover drivers need to carefully navigate these areas.
Curiositys 36 Drill Holes: This grid shows all 36 holes drilled by NASAs Curiosity Mars rover using the drill on the end of its robotic arm. The rover analyzes powderized rock from the drilling activities. The images in the grid were captured by the Mars Hand Lens Imager (MAHLI) on the end of Curiositys arm. Credit: NASA/JPL-Caltech/MSSS
The hills blocked Curiositys view of the sky, requiring the rover to be carefully oriented based on where it could point its antennas toward Earth and how long it could communicate with orbiters passing overhead.
After braving those risks, the team was rewarded with some of the most inspiring scenery of the mission, which the rover captured with an August 14 panorama using its Mast Camera, or Mastcam.
We would get new images every morning and just be in awe, said Elena Amador-French of JPL. The sand ridges were gorgeous. You see perfect little rover tracks on them. And the cliffs were beautiful we got really close to the walls. Amador-French is Curiositys science operations coordinator, who manages collaboration between the science and engineering teams.
Curiositys 36th Drill Hole at Canaima: Curiosity used its Mast Camera, or Mastcam, to capture this image of its 36th successful drill hole on Mount Sharp, at a rock called Canaima. The rovers Mars Hand Lens Imager took the inset image. The pulverized rock sample was acquired on October 3, 2022, the missions 3,612th Martian day, or sol. Credit: NASA/JPL-Caltech/MSSS
However, this new region comes with its own challenges: While scientifically compelling, the rockier terrain makes it harder to find a place where all six of Curiositys wheels are on stable ground. If the rover isnt stable, engineers wont risk unstowing the arm, in case it might bang into the jagged rocks.
The more and more interesting the science results get, the more obstacles Mars seems to throw at us, Amador-French said.
But the rover, which recently marked its 10th year on Mars, and its team are ready for this next chapter of their adventure.
More About Curiosity
The Curiosity mission is led by NASAs Jet Propulsion Laboratory (JPL), which is managed by the California Institute of Technology (Caltech) in Pasadena, California. JPL leads the mission on behalf of NASAs Science Mission Directorate in Washington. Malin Space Science Systems in San Diego built and operates Mastcam.
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