Researchers at the University of Sydney have recreated analogues of cosmic dust in the laboratory. The work offers a fresh window into the chemical pathways that operate in the space between stars, pathways that may have delivered organic precursors to the early Earth.
Linda Losurdo, a PhD candidate in materials and plasma physics, led the experiments alongside Professor David McKenzie. Their paper appeared in The Astrophysical Journal earlier this year.
The team placed mixtures of nitrogen, carbon dioxide and acetylene inside glass tubes emptied by a vacuum pump. They then applied a high-voltage electrical discharge of roughly 10,000 volts for about an hour. The resulting glow discharge plasma transformed the gases into carbon-rich dust containing complex CHON molecules.
Those laboratory grains, collected on silicon chips, produced infrared signatures that match the spectra of real cosmic dust observed in space. The match allows scientists to probe the conditions under which such particles form near stars and supernovae.
We no longer have to wait for an asteroid or comet to come to Earth to understand their histories. You can build analogue environments in the laboratory and reverse engineer their structure using the infrared fingerprints.
Losurdo offered that assessment in the university's February release. Her remark captures the practical advance: controlled replication replaces reliance on rare extraterrestrial samples.
The study distinguishes the effects of ion bombardment from those of temperature in dust formation. By varying the laboratory parameters, the researchers can now interpret the history recorded in meteorites and asteroid fragments.
