Tryptophan is one of 20 amino acids essential for forming key proteins needed for life.
, IC348 is one of the closest star-forming regions to our planet. Though IC348 is usually invisible to the naked eye, the region shines brightly in infrared light. Analyzing these infrared emissions from the region, Iglesias-Groth found 20 emission lines of the molecule tryptophan.
This kind of analysis of light, called spectroscopy, reveals the chemical composition of molecular clouds, interstellar gas, stars and thebecause different chemical elements and compounds absorb and emit light at characteristic wavelengths. This means they leave their"fingerprint" on the light that passes through them, fingerprints that space telescopes can uncover.An artist's depiction of the discovery of evidence for tryptophan in the Perseus molecular complex.
"The novelty is that we see the molecules in the diffuse gas from which stars and protoplanetary discs are forming." The significance of these prebiotic molecules in these clouds of gas and dust is that it makes it possible that young planets, as they form, could accrete these molecules to their surfaces and potentially support the development of life. Alternatively, these molecules could be sealed up inwhich are created from the material left over when planets are born and later delivered to other planets' surfaces during the turbulent early years of planetary systems via impacts.
Whatever the delivery mechanism, once on the planet surfaces, these molecules could engage in the chemical processes that form proteins and eventually lead to the development of life.
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