Lab-made cosmic dust reveals clues to life's origins
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Researchers at the University of Sydney have created cosmic dust from scratch by recreating space-like conditions inside glass tubes. The dust contains complex carbon-rich molecules built from elements essential to life and produces infrared signals similar to real material found in space. The findings, published in The Astrophysical Journal, offer new clues about how organic chemistry unfolds around stars.
The Experiment
Linda Losurdo, a PhD candidate in materials and plasma physics at the University of Sydney, combined nitrogen, carbon dioxide and acetylene to simulate energetic conditions near stars and supernova remnants. She then exposed the gases to a powerful electrical charge, creating carbon-rich dust resembling material that floats through interstellar space and is preserved inside comets, asteroids and meteorites.
Molecular Fingerprints
The laboratory dust contains complex combinations of carbon, hydrogen, oxygen and nitrogen — known as CHON molecules — found in many organic substances considered important for life. Astronomers identify cosmic dust types by studying infrared light they emit; Losurdo's samples produced the same distinctive infrared signatures seen in space, indicating the experiment closely reproduces real cosmic processes.
Implications for Origins
"We no longer have to wait for an asteroid or comet to come to Earth to understand their histories," Losurdo said. The method allows researchers to reverse-engineer dust structure using infrared fingerprints, providing insight into how carbonaceous cosmic dust forms in plasma from old stars or in stellar nurseries, potentially distributing molecules vital for life.
What's Next
The team plans to analyze additional dust samples to explore how different gas mixtures affect molecular complexity. It remains unclear whether these laboratory conditions fully replicate the timescales and radiation environments of actual stellar nurseries.
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Lab-made cosmic dust reveals clues to life's origins
