TL;DR
NASA’s Curiosity rover captured its first high-altitude twilight clouds of the Martian autumn in late-afternoon images taken during sols 5036–5042. The rover was also finishing drill work at Basque Lakes before a planned drive toward the Chiu Chiu region.
NASA’s Curiosity rover captured the first high-altitude twilight clouds of the Martian autumn in late-afternoon images taken at Gale Crater during sols 5036–5042, the mission team reported Oct. 19. The rover was also completing drill-related science at Basque Lakes before a planned departure toward the Chiu Chiu region.
The cloud observations came from late-afternoon Navcam movies collected on Wednesday, according to atmospheric scientist Alex Innanen of York University, who wrote the NASA Science blog update. The clouds were visible in the rover’s raw images because twilight lighting made them bright enough to stand out. Innanen said many clouds seen around Gale Crater are suboptical—too thin to be visible to human eyes or Curiosity’s cameras.
At Basque Lakes, the team was wrapping up its drill campaign. After reviewing results from earlier laboratory activities, the Sample Analysis at Mars (SAM) team chose to add a gas chromatograph/mass spectrometry experiment, or GCMS. NASA’s report describes GCMS as energy-intensive, but says the plan included four sols for activities, leaving time for Mastcam and ChemCam remote sensing and contact science on the drill tailings, the rock and mineral material left by drilling.
The following weekend’s plan allocated two more sols to finish work at the site and collect any remaining science observations. The team planned to drive toward crystal forms previously observed in the Chiu Chiu region. These were stated plans in the Oct. 19 report; the post did not say that the drive had already taken place.
Autumn Clouds Join the Science Plan
The images give the mission team an early seasonal observation of cloud activity over Gale Crater. NASA’s account says high-altitude twilight clouds return in Martian autumn and become more active as the season progresses. Recording them lets researchers track visible atmospheric conditions while Curiosity continues its geology work on the surface.
The update also shows how atmospheric observations fit alongside the rover’s planned work at a drill site. Curiosity’s schedule combined a SAM laboratory experiment, remote imaging and contact science, with cloud movies collected during the same broader planning period. The report does not present a new scientific conclusion about the clouds or explain their composition; its immediate result is the capture of the season’s first reported high-altitude twilight clouds at this location.
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Mars Year 39 at Gale Crater
The mission team marks a new Martian year at the start of northern spring, the vernal equinox. It tracks the seasons by solar longitude, or Ls: a full orbit is 360 degrees, divided into four 90-degree seasons. NASA’s update says Mars year 39 began at Ls 0° near the end of September 2026 on Earth.
Gale Crater lies just south of Mars’ equator, so the new year’s start brought autumn there. The team had marked the new year while conducting its drill campaign at Basque Lakes. The update follows a previous week’s work and describes plans to finish the site’s activities before moving toward Chiu Chiu; it does not provide a precise arrival date or distance for that planned drive.
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Cloud Frequency and Drive Timing
The update does not report how many clouds appeared in the movies, how long they persisted, or what they were made of. It also does not give measurements of their altitude or provide an analysis of how this season’s activity compares with earlier Martian autumns. The post describes them as high-altitude twilight clouds and says they were bright enough to appear in raw Navcam images.
The rover’s drive toward Chiu Chiu was a planned next step, not a completed movement in the report. NASA did not specify the drive’s exact timing, the distance involved or when Curiosity might reach the crystal forms. The update also does not state the outcome of the additional GCMS experiment.
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Finishing Basque Lakes Work
According to the mission team’s plan, Curiosity would spend two further sols completing drill activities at Basque Lakes and gathering any remaining contact or remote observations before departing. The next stated destination was the Chiu Chiu region, where the team had previously seen crystal forms.
As the Martian autumn progresses, the team expects twilight cloud activity to pick up and says it will continue observing the atmosphere. Future mission updates may report additional cloud movies and results from the planned laboratory work, but the Oct. 19 post did not set dates for either.
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Key Questions
What did Curiosity see during sols 5036–5042?
Curiosity’s late-afternoon Navcam movies captured the first high-altitude twilight clouds of the season reported at Gale Crater. The clouds were bright enough to appear in the rover’s raw images.
Why were these clouds visible in the images?
NASA atmospheric scientist Alex Innanen said the low Sun angle at sunset illuminates the twilight clouds. Many other clouds at Gale Crater are suboptical, meaning they are too thin to be seen by people or by Curiosity’s cameras.
What science was Curiosity doing at Basque Lakes?
The rover was finishing a drill campaign, including a planned GCMS experiment by the SAM team, remote sensing with Mastcam and ChemCam, and contact science on drill tailings.
Where was Curiosity expected to go next?
The mission team planned to finish work at Basque Lakes and then drive toward the Chiu Chiu region, where it had previously observed crystal forms. The report did not say the drive had already happened or give an arrival date.
Source: primary
