Study Findings: Core Metamorphism Controls the Dynamic Habitability of Mid-sized Ocean Worlds—The Case of Ceres

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Image (Credit): Dwarf planet Ceres. (NASA/JPL)

Science Advances abstract of the study findings:

Ceres’s surface mineralogy and density structure indicate an aqueous past. Observations from the Dawn mission revealed that Ceres likely hosted a global subsurface ocean in its early history, which was the site of pervasive aqueous alteration of accreted material. Subsurface environmental constraints inferred from Ceres’s surface mineralogy, combined with Ceres’s high abundance of carbon, suggest that the dwarf planet may have been habitable for microbial life. We present a coupled chemical and thermal evolution model tracking Ceres’s interior aqueous environment through time. If the rocky interior reached ≳550 K, then fluids released by rock metamorphism would have promoted conditions favorable for habitability by introducing redox disequilibrium into the ocean, a source of chemical energy for chemotrophs. We find that this period would have been between ~0.5 and 2 billion years after Ceres’s formation. Since then, Ceres’s ocean has likely become a cold, concentrated brine with fewer sources of energy, making it less likely to be habitable at present.

Citation: Samuel W. Courville, S.W., Castillo-Rogez J.C., Daswani, M.M. et al. Core metamorphism controls the dynamic habitability of mid-sized ocean worlds—The case of Ceres, Science Advances, Vol 11, Issue 34 (August 20, 2025).

https://doi.org/10.1126/sciadv.adt3283

Study-related stories:

The Register – “Dwarf Planet Ceres May Have Been Habitable – for Microbes – a Couple of Billion Years Back”

Perplexity – “Dwarf Planet Ceres May Have Harbored Ancient Microbial Life”

Astrobiology – “Ceres May Have Had Long-Standing Energy to Fuel Habitability”

Pic of the Week: Hurricane Erin in the Caribbean Sea

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Image (Credit): Hurricane Erin in the Caribbean Sea on August 18, 2025. (NASA Earth Observatory images by Michala Garrison, using MODIS data from NASA EOSDIS LANCE and GIBS/Worldview, and the Suomi National Polar-orbiting Partnership)

This week’s image is from the NASA Earth Observatory. It shows Hurricane Erin, the first Atlantic hurricane in the 2025 season, as it travels through the Caribbean Sea earlier this week. The image below labels the various islands in the image.

Image (Credit): Hurricane Erin in the Caribbean Sea on August 18, 2025 (with island identifiers). (NASA Earth Observatory images by Michala Garrison, using MODIS data from NASA EOSDIS LANCE and GIBS/Worldview, and the Suomi National Polar-orbiting Partnership)

Space Stories: New Glenn’s Martian Probes, AI Space Doctors, and Questions About a Mission to Uranus

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Image (Credit): Blue Origin’s New Glenn Rocket. (Blue Origin)

Here are some recent space-related stories of interest.

—Space.com: “Blue Origin’s 2nd New Glenn Rocket Launch will Fly Twin NASA Mars Probes to Space on Sep. 29“

Blue Origin is gearing up for the second-ever launch of its powerful New Glenn rocket, which will loft NASA’s ESCAPADE mission to Mars. The company says it has been working closely with NASA on preparations leading up to New Glenn’s next launch, dubbed NG-2, and is targeting no earlier than (NET) Sep. 29. The twin ESCAPADE (Escape and Plasma Acceleration and Dynamics Explorers) probes have been awaiting their turn aboard New Glenn, which was originally slated to carry the satellites on its maiden launch in January. However, NASA opted not to risk a costly mission delay due to the debut liftoff of the new rocket.

—American Bazaar: “NASA and Google Test AI Medical Assistant for Astronaut Missions“

NASA, which is committing to a new era of human spaceflight with its Artemis mission, is working with Google to test a proof of concept for Crew Medical Officer Digital Assistant (CMO‑DA), a type of Clinical Decision Support System (CDSS). This has been created to allow astronauts to diagnose and treat symptoms when no doctor is available or communications to Earth are blacked out. “Trained on spaceflight literature, the AI system uses cutting-edge natural language processing and machine learning techniques to safely provide real-time analyses of crew health and performance,” Google representatives said in a statement.

—Scientific American:“NASA Budget Cuts Could End U.S. Exploration of the Outer Solar System“

In the spring of 2022 the U.S. space community selected its top priority for the nation’s next decade of science and exploration: a mission to Uranus, the gassy, bluish planet only seen up close during a brief spacecraft flyby in 1986. More than 2.6 billion kilometers from Earth at its nearest approach, Uranus still beckons with what it could reveal about the solar system’s early history—and the overwhelming numbers of Uranus-sized worlds that astronomers have spied around other stars. Now President Donald Trump’s proposed cuts to NASA could push those discoveries further away than ever—not by directly canceling the mission but by abandoning the fuel needed to pull it off.

Americans Still Believe in Returning to the Moon and Visiting Mars

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With all of the current chaos related to NASA funding, one might think America has moved away from its previous support for space missions. However, a poll reported last month by CBS News tells a different story.

As shown in the image above, 67 percent of Americans polled by CBS News and YouGov are in favor or NASA returning astronauts to the Moon, and 65 percent feel the same way about a trip to Mars.

This is encouraging yet may not be enough to save NASA as it faces severe budget cuts and the loss of thousands of employees.

Some might say that the cuts are unrelated to the Moon and Mars missions, which are still being funded by the White House. However, that does not matter. NASA is losing expertise in all areas while its employees feel harassed and unappreciated. It is hard to build a successful space program on top of this disarray.

If so many Americans believe we should be back on the Moon and travel to Mars, how will they feel should China beat us to one or both? How will the current White House be viewed?

Maybe that is what should keep the White House and others proposing these drastic cuts up at night.

Pic of the Week: Student-Designed Artemis II Posters

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Credit: Mingyi Gan.

The above image is one of 24 winning posters designed by students at the School of Visual Arts (SVA) in New York City. The contest, sponsored by SVA and NASA, is called The Artemis II/Earthrise Poster Project.

All of the posters will be on display next month at the SVA Gramercy Gallery located at 209 East 23rd Street, 1st floor, New York, NY 10010.

You can learn more about the event and view more of these creative posters at this link.