“The outer boundaries of the galactic habitable zone could be further away than what we previously thought.”
The discovery of phosphorus in a cloud at the edge of the Milky Way has extended the region in our galaxy where life might be found., along with nitrogen, carbon, hydrogen, oxygen and sulfur . Until now, it had been the only one of those elements missing from the farthest reaches of our galaxy.
Looking for phosphorus in that distant cloud was a long shot, says astrochemist Lucy Ziurys, Koelemay’s collaborator at the University of Arizona in Tucson. The element is produced only in supernovas. But there’s not a lot of material in the outer Milky Way, so it’s hard to build stars big enough to end their lives in
One way phosphorus could have ended up in the outer galaxy is through a supernova closer to the center that launched a “galactic fountain,” Ziurys says. “A supernova explodes, the material gets thrown out of the galactic plane, then settles back down near the galactic edge.” The material would be very diluted there, but “if there are different supernovae going off, they’re going to keep polluting the outer galaxy,” she says.
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