The Jezero Threshold: Preface
On 10th September, 2025, NASA made an announcement about a potentially groundbreaking discovery. Here's what they said.
On 18th July 2024, Perseverance observed distinct patterns, later named "leopard spots" on a rock at the Jezero crater on Mars (a dried out lakebed). In this rock, nicknamed Cheyava Falls, they identified two key minerals- Vivianite (an iron phosphate) and Greigite (an iron sulfide). On Earth, these minerals are formed in wet, low oxygen settings by chemosynthetic organisms. While they may also be formed by inorganic processes, NASA has not been able to determine the presence of any such process at this location after a year of research. Considering that the Jezero crater is also rich in organic compounds, this is considered to be the strongest evidence yet of possible ancient life on Mars.
While this news is certainly exciting, no confirmation can be given until the samples are returned to Earth for more rigorous testing. The Mars Sample Return mission was originally planned for 2033, but that looks increasingly unlikely as NASA and ESA face budget concerns. Nevertheless, once the samples return, one of the tests that can be run is the analysis of the isotope distribution of Carbon. Life prefers lighter isotopes, hence the ratio of C12 to C13 in living matter is slightly higher than in non living matter.
Huge scientific discoveries rarely emerge in spontaneous "Aha!" moments, they often emerge gradually through rigorous research and debate. If it is proven that life once existed on Mars, humanity will face new questions about the origin of life, philosophy, theology, and astronomy. This announcement has been at the forefront of my imagination ever since I came across it, and inspired me to write The Jezero Threshold. Join me on this journey as we explore an existential take on this discovery.
https://www.nasa.gov/news-release/nasa-says-mars-rover-discovered-potential-biosignature-last-year
https://www.nature.com/articles/s41586-025-09413-0
https://www.nationalgeographic.com/science/article/mars-rock-alien-life-microbes-chemistry
This story is also loosely inspired by the Akkadian myth of Atra-Hasis.
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