TLDR
Scientists studied tiny pieces from asteroid Bennu and found that the building blocks of life, like amino acids, can form in more than one way in space.
Summary
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1 Study Aim
The paper aims to determine how amino acids (the basic components of proteins) formed in the early Solar System by analyzing the carbon and nitrogen isotopes (different forms of the same element) in samples from asteroid Bennu. The researchers want to compare these results with those from the well-known Murchison meteorite to understand if different chemical processes created these molecules in different places or times. Simply put: The study wants to find out how life's building blocks formed in space by looking at their chemical fingerprints.
2 Study Design
The researchers used advanced techniques to measure very small amounts of carbon and nitrogen isotopes in amino acids from Bennu samples collected by NASA's OSIRIS-REx mission. They also analyzed similar molecules from the Murchison meteorite for comparison. The team measured isotope values within individual molecules and across different types of molecules, focusing on glycine, β-alanine, and both forms (D and L) of glutamic acid. This approach allowed them to identify differences in how these molecules formed and changed over time. Simply put: The scientists compared the chemical makeup of molecules from Bennu and a meteorite to see how they were made.
3 Findings
The study reveals that the carbon and nitrogen isotope patterns in Bennu's amino acids are different from those in the Murchison meteorite. The authors argue that glycine in Murchison likely formed in water through a process called Strecker synthesis, while glycine in Bennu probably formed in very cold ices far from the Sun, using a different chemical reaction. The research demonstrates that Bennu's amino acids have unusually high nitrogen-15 values, supporting the idea of a unique formation environment. The findings also show that the two mirror-image forms of glutamic acid in Bennu have different nitrogen isotope values, challenging the assumption that such pairs are always chemically identical. These results suggest that multiple chemical pathways created amino acids in the early Solar System, which could have influenced the origins of life on Earth. Simply put: The study found that life's building blocks formed in different ways in space, depending on where and how they were made.