Keith Cooper is a freelance science journalist and editor in the United Kingdom, and has a degree in physics and astrophysics from the University of Manchester. He's the author of 'The Contact Paradox: Challenging Our Assumptions in the Search for Extraterrestrial Intelligence' (Bloomsbury Sigma, 2020) and has written articles on astronomy, space, physics and astrobiology for a multitude of magazines and websites.
. Their ubiquity is what makes them useful potential building blocks for life, but it also makes them important tracers for star-formation.
Previous models had predicted that the harsh radiation around the supermassive black hole at the core of an active galaxy would actually destroy all PAH molecules. Instead, MIRI discovered that PAHs were plentiful in the central regions of all three galaxies studied. However, the observations showed that the emission was coming from larger and electrically neutral PAH molecules, indicating that radiation had indeed eradicated smaller, electrically charged PAHs.
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