Topic: Space

Scientists from NASA and Penn State recreated Martian conditions to test if ancient microbes could survive in ice. They found that amino acids from E. coli bacteria could last over 50 million years even under cosmic radiation.

Mars missions should focus on pure ice or ice-rich permafrost instead of rocks, clay, or soil. This is because ancient life forms, like microbes, can be preserved in Martian ice deposits for tens of millions of years.

Scientists from NASA Goddard Space Flight Center and Penn State recreated Mars-like conditions in the laboratory to test this idea. They found that pieces of amino acids from E. coli bacteria could survive more than 50 million years even under constant cosmic radiation.

The team sealed E. coli bacteria inside test tubes filled with pure water ice. Other samples were combined with water and materials commonly found in Martian sediment, including silicate-based rocks and clay. The frozen samples were placed in a gamma radiation chamber at Penn State's Radiation Science and Engineering Center.

The results were striking. In pure water ice, more than 10 percent of the amino acids survived the full 50 million year simulation. By contrast, samples mixed with Martian-like sediment broke down 10 times faster and did not survive.

Pure Ice Protects Organic Molecules: The findings suggest that missions searching for life on Mars should prioritize pure ice or ice-rich permafrost instead of focusing mainly on rocks, clay, or soil.

Implications for Europa and Enceladus: The team also tested organic material at temperatures similar to those on Europa, an icy moon of Jupiter, and Enceladus, an icy moon of Saturn. At those even colder temperatures, deterioration slowed down further.

Why It Matters

This discovery is important for Indian students because it shows that life forms can survive in extreme conditions, which could have implications for the search for life on other planets and moons.

Key Facts

• Scientists from NASA Goddard Space Flight Center and Penn State recreated Mars-like conditions to test if ancient microbes could survive in ice.
• Amino acids from E. coli bacteria could last over 50 million years even under cosmic radiation.
• Pure water ice protected organic molecules, while mixed samples broke down faster.
• The findings suggest that missions searching for life on Mars should prioritize pure ice or ice-rich permafrost.
• The discovery has implications for the search for life on other planets and moons.

Key Terms

Amino acids

Building blocks of proteins that are essential for life.

Implications

This discovery is important for Indian students because it shows that life forms can survive in extreme conditions, which could have implications for the search for life on other planets and moons.