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Pyrene molecules, which are four-ring, 16-carbon polycyclic hydrocarbons, are likely formed around giant stars. This artist's rendering shows the molecules in an asteroid belt, with carbon atoms shown in black and hydrogen atoms in white. Scientists have recreated the chemical steps for making pyrene in space. (Credit: NASA-JPL-Caltech)

How to make space molecules?

Complex carbon-based particles found in meteorites have for some time been a problem for Earth-bound scientists. Thus scientists are very keen to know how...