Amino acids are the building blocks for proteins, which form all living cells. Detecting them on Mars may indicate that life either exists or existed there.
How Amino Acids Could Survive Millions of Years on Mars’ Icy Surface
Scientists are investigating how long amino acids, essential building blocks of life, can survive beneath Mars’s icy surface. This research is crucial because upcoming Mars missions aim to find signs of current or past life. Knowing whether these important molecules can last under harsh space conditions helps decide where to look on Mars.
Amino acids are the building blocks for proteins, which form all living cells. Detecting them on Mars may indicate that life either exists or existed there. But Mars has a thin atmosphere and no strong magnetic field. These conditions expose its surface to dangerous cosmic rays. These rays break down organic molecules like amino acids over time.
The Challenge of Cosmic Rays on Mars
Mars’s surface gets hit by charged particles called galactic cosmic rays (GCRs) and solar cosmic rays (SCRs). Unlike sunlight, these rays can penetrate ice and rock several meters deep, inducing chemical changes that slowly destroy biomolecules.
The Role of UV Radiation vs. Cosmic Rays
Ultraviolet (UV) radiation, coming from the Sun, only affects the very top millimeter of soil or ice. Hence, astronauts or rovers could drill just a little below the surface to avoid UV damage. However, cosmic rays penetrate much deeper and could erase organic traces in shallow subsurface layers over millions of years.
The Experiment: Simulating Cosmic Radiation Effects on Amino Acids
The research team exposed various amino acid samples to gamma radiation in labs simulating conditions found beneath Martian ice at low temperatures. They used pure water ice mixtures and included organic matter from Escherichia coli, a common Earth bacterium that served as a model for biological samples.
Amino acids mixed with ice were tested.
Researchers subjected amino acids dissolved in frozen water to increasing radiation doses of up to 2 million Gray (MGy). This extreme exposure models millions of years’ worth of cosmic ray bombardment on Mars.
The Role of Silicates Was Investigated Too
The scientists also tested amino acids mixed with minerals like montmorillonite clay—a material found naturally on Mars—as well as fused silica powder. This helped determine if these compounds protect amino acids from radiation damage.
Main Findings That Guide Future Life Searches
- Amino acids embedded in pure ice survived long-term radiation better than those mixed with minerals.
- Mars’s surface icy deposits likely hold preserved amino acids for over 50 million years under current cosmic ray fluxes.
- Molecules mixed with silicates degraded faster, suggesting that pure ice environments offer the best protection for detecting recent organics.
- The temperature influenced degradation rates; warmer icy environments accelerated amino acid breakdown.
What Does This Mean for Future Missions?
This research provides clear guidance to space agencies developing next-generation missions focused on searching for active life or recent biological markers on Mars. Exploring areas rich in pure surface ice or ice-dominated permafrost offers the best chance of finding intact biosignatures before they degrade too much by radiation exposure.
Missions Targeting Ice-Rich Locations
For example, proposed missions such as the Mars Life Explorer aim to drill into near-surface icy soils, which may still preserve residues after millions of years. These sites offer the strongest hope for detecting compounds linked with living or dormant organisms right now.
The Importance of Protecting Sample Integrity
Certainly, understanding how different materials affect biomolecule stability ensures that chosen sampling techniques maximize chances without destroying fragile evidence by accident during collection or transit back to Earth scientists’ labs.
Additionally, to stay updated with the latest developments in STEM research, visit ENTECH Online. Basically, this is our digital magazine for science, technology, engineering, and mathematics. Further, at ENTECH Online, you’ll find a wealth of information.
Reference
- Pavlov, A. A., McLain, H. L., Farnsworth, K. K., Glavin, D. P., Elsila, J. E., Dworkin, J. P., Zhang, Z., & House, C. H. (2025). Slow radiolysis of amino acids in Mars-like permafrost conditions: Applications to the search for extant life on Mars. Astrobiology, 25(9), 601–610. https://doi.org/10.1177/15311074251366249
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I’m a web developer and science writer with a Master’s degree in Computer Applications (MCA) from Pune University.
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