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Sols 4316-4317: Hunting for Sulfur
This image was taken by the Left Navigation Camera (NavCam) aboard NASA’s Mars rover Curiosity, and captures the bright stones of the “Sheep Creek” target — just above the rover wheel – which strongly resemble elemental sulfur blocks identified earlier in the traverse. This image was taken on sol 4314, Martian day 4,314 of the Mars Science Laboratory mission, on Sept. 24, 2024, at 20:24:50 UTC. NASA/JPL-Caltech Earth planning date: Wednesday, Sept. 25, 2024
Navigating the rugged, unforgiving Martian terrain is always a challenge, and our recent attempt to reach the “Sheep Creek” target highlights this. We had aimed for small, distant bright rocks, but from 50 meters away (about 164 feet), the limited resolution of our images made it difficult to fine-tune navigation. After an ambitious drive, the rover came agonizingly close — stopping just short of these small bright rocks. The rocks, with their distinctive rounded and pitted “weathering” pattern (pictured), strongly resemble elemental sulfur blocks that we’ve encountered before. Frustratingly, although the target rocks were right under the front wheel and clearly visible in our navigation cameras, they remained just out of reach of the rover’s arm.
While the rover’s arm couldn’t quite reach the bright stones of Sheep Creek, we didn’t let that stop us and planned to use other onboard instruments to help us analyze the composition, textures, and context before we move to our next position. As the Keeper of the Plan for the Geology and Mineralogy theme group, my role was to ensure all those activities were recorded in the plan.
To find out the composition of the stones of Sheep Creek, we used ChemCam (our onboard laser) to observe two promising stones we’ve named “Arch Rock” and “Ash Mountain.” We’re hoping to see if they have any evidence of elemental sulfur as their appearance suggests. For a closer look at the texture, we will take high-resolution, color images with Mastcam (which you can also view in 3D with red and blue anaglyph glasses!). We also want to look at an interesting transition between light-colored and dark-colored bedrock nearby, which we will cover with more high-resolution, colored images. This transition could give us clues about where the unusual white rocks of Sheep Creek came from and how they formed.
We had our eye on another bright rock in the area, named “Beryl Lake.” It had an interesting bright-toned crusty appearance and as we could reach it with the rover arm, we used our APXS tool (think of it as a chemical scanner) to see its composition and if it had any traces of sulfur. We took a closer look with our rover hand lens (MAHLI) at a rock called “Aster Lake,” which had intriguing white patches that might be similar to the stones of Sheep Creek. Ultimately, our science goal this plan was to collect data on whether these bright-toned stones had evidence of elemental sulfur and increase our understanding on how they formed.
Next, we’ll carefully reposition the rover to move closer to these interesting targets — a maneuver that we call a “bump” — so that next plan, set to occur over the weekend, we’ll be able to get up close and personal with the white stones of Sheep Creek. While the rover waits for the weekend plan, we’re setting up the rover to do some “untargeted” science after the drive. This includes using an automated tool called AEGIS that finds interesting targets on its own and zaps them with the ChemCam laser. Plus, it’s a good time to record some observations of the modern Martian environment, so we’ll make the most of the time to measure dust levels, take movies that will hopefully capture some dust devils, and look at clouds — if any — in the Martian sky.
We’re looking forward to the weekend plan to hopefully get another chance to do some contact science on targets that may be rich in sulfur!
Written by Amelie Roberts, Ph.D. Candidate at Imperial College London
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Last Updated Sep 27, 2024 Related Terms
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By NASA
7 Min Read NASA Project in Puerto Rico Trains Students in Marine Biology
A forested green peninsula of Culebra Island juts into the blue waters of the Caribbean as a rain storm hits in the distance. The teal blue surrounding the island indicates shallow waters, home to the island's famous coral reefs. Credits: NASA Ames/Milan Loiacono Tainaliz Marie Rodríguez Lugo took a deep breath, adjusted her snorkel mask, and plunged into the ocean, fins first. Three weeks earlier, Rodríguez Lugo couldn’t swim. Now the college student was gathering data on water quality and coral reefs for a NASA-led marine biology project in Puerto Rico, where she lives.
“There is so much life down there that I never knew about,” Rodríguez Lugo said. “And it’s beautiful.”
“There is so much life down there that I never knew about, and it’s beautiful.”
Tainaliz Marie Rodríguez Lugo
OCEANOS 2024 Intern
The sea whip and purple sea fans in the photo above are found off the coast of Playa Melones, Culebra, a small island off the east cost of Puerto Rico and a popular destination for snorkelers.
Puerto Rico is home to more than 1,300 square miles of coral reefs, which play a vital role in protecting the island from storms, waves, and hurricanes. Reef-related tourism provides nearly $2 billion in annual income for the island.
But coral reefs in Puerto Rico and around the world are experiencing more frequent and severe bleaching events. High ocean temperatures in regions around the globe have led to coral bleaching, which is when corals expel zooxanthellae – the colorful, symbiotic microscopic algae that live inside coral tissues and provide 80-90% of its nutrients. When stressors persist, the corals eventually starve and turn bone-white.
In April 2024, NOAA (National Oceanic and Atmospheric Administration) announced that the world was experiencing a global bleaching event, the fourth on record. You can see bleached spots in the lobed star coral pictured above, which is also colonized by Ramicrusta, an invasive, burnt orange algae that poses an additional threat to reefs.
Students Are Given Ocean Research Tools
Beginning in June, the month-long program that Rodriguez and 29 other local students participated in is called the Ocean Community Engagement and Awareness using NASA Earth Observations and Science for Hispanic/Latino Students (OCEANOS). The goal of OCEANOS is twofold: to teach Puerto Rican students about marine ecology and conservation, and to train students through hands-on fieldwork how to use marine science tools to monitor the health of coral reefs.
The course included classroom instruction, scientific fieldwork, collecting and analyzing ocean data from La Parguera and Culebra Island, and a final presentation.
In the photo, OCEANOS instructor Samuel Suleiman shows a 3D-printed clump of staghorn coral to a group of students off the coast of Culebra. In areas where coral habitats have been damaged, conservationists use 3D-printed corals to attract and protect fish, algae, and other wildlife.
To practice coral surveying techniques and evaluate biodiversity,students used compact cameras to snap a photo every half second, recording seven-meter by seven-meter quadrants of the ocean floor. Back on land, the students stitched these images – roughly 600 images per quadrant – into high-resolution mosaics, which they then used to catalog the types and distributions of various coral species.
Low Light, Poor Water Quality, and Invasive Species Threaten Coral Reefs
Students also built their own low-cost instruments, with sensors on each end to measure temperature and light, to help assess water quality and characteristics.
The ideal temperature range for coral falls between 77- 82 degrees Fahrenheit (25-28 degrees Celsius). Water above or below this range is considered a potential stressor for coral and can impair growth. It can also increase the risk of disease, bleaching, and reproductive issues.
Coral relies on light for growth. Less light means less photosynthesis for the zooxanthellae that live inside the coral, which in turn means less food for the coral itself. Cloudy water due to excessive sediment or phytoplankton can dim or block sunlight.
Additional threats to coral include fishing equipment, boat groundings, chemical runoff, and invasive species.
In the photo above, OCEANOS instructor Juan Torres-Pérez holds two clumps of cyanobacteria, a type of bacteria that has choked a section of reef near Playa Melones. The exact cause of this excessive cyanobacteria growth is unclear, but it is likely due to land-based pollution leaching into nearby waters, he said. In the background, dark brown piles of cyanobacteria littering the ocean floor are visible.
Students Help Grow and Plant New Coral
Suleiman walked students through the process of planting new coral, which involved tying loose staghorn and elkhorn corals into a square frame. Each frame holds about 100 individual pieces of coral. Suleiman leads a group called Sociedad Ambiente Marino (SAM), which has been working for more than 20 years to cultivate and plant more than 160,000 corals around Puerto Rico.
Divers anchored these frames to the ocean floor. Under ideal conditions, branching species like elkhorn and staghorn coral grow one centimeter per month, or about 12-13 centimeters per year, making them ideal candidates for coral reef restoration. By comparison, mountainous and boulder coral, also prevalent in the Caribbean Sea, grow an average of just one centimeter per year.
The frames will remain on the ocean floor for 10 to 14 months, until the corals have quadrupled in size. At any given time, SAM has about 45 of these frames in coral ‘farms’ around Culebra, totaling almost 4,500 corals.
Once the corals are ready to be planted, they will be added to various reefs to replace damaged or bleached corals, and shore up vulnerable habitats.
In the photo above, Suleiman gathers loose corals to place around an endangered coral species Dendrogyra cylindrus, more commonly referred to as Pillar Coral (front left). This underwater “garden,” as he called it, should attract fish and wildlife such as sea urchins, which will give the endangered coral — and the other species in this small reef — a better chance of survival.
A New Generation of Marine Scientists
From the 2023 OCEANOS class, roughly half of the undergraduate students went on to pursue marine science degrees, and many hope to continue with a post-graduate program. For a scientific field historically lacking diverse voices, this is a promising step.
Among the high school students in the 2023 class, three went on to change their degree plans to oceanography after participating in the OCEANOS program, while others are finding ways to incorporate marine science into their studies.
Francisco Méndez Negrón, a 2023 OCEANOS graduate, is now a computer science student at the University of Puerto Rico at Rio Piedras and wants to apply robotics to marine ecology. “My goal is to integrate computer science and oceanography to make something that can contribute to the problems marine ecosystems are facing, mostly originated by us humans,” Méndez Negrón said. He returned to the OCEANOS program to serve as a mentor for the 2024 class.
As for Tainaliz Marie Rodriguez Lugo, she managed to overcome her swim anxiety while discovering a love of the ocean. She credited the instructors who were patient, encouraging, and never left her side in the water.
“I was really scared going into this internship,” Rodríguez Lugo said. “I didn’t know how to swim, and I was starting a program literally called ‘Oceans.’ But now I love it: I could spend all day in the ocean.”
I was really scared going into this internship. I didn’t know how to swim, and I was starting a program literally called ‘Oceans.’ But now I love it: I could spend all day in the ocean.
Tainaliz Marie Rodríguez Lugo
OCEANOS 2024 Intern
When asked how she would describe coral to someone who has never seen one, Rodríguez Lugo just laughed. “I can’t. There are no words for it. I would just take them to the reefs.”
For more information about OCEANOS, visit:
https://www.nasa.gov/oceanos
The OCEANOS program’s final session will take place next year. Applications for the 2025 OCEANOS program will open in March. To apply, visit:
https://nasa.gov/oceanos-application
Photographs and story by Milan Loiacono, NASA’s Ames Research Center
About the Author
Milan Loiacono
Science Communication SpecialistMilan Loiacono is a science communication specialist for the Earth Science Division at NASA Ames Research Center.
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Last Updated Aug 28, 2024 Related Terms
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