Beneath the ancient canyon walls of Gediz Vallis on Mars, University of New Brunswick researchers have helped uncover something the Red Planet had never before revealed: pure elemental sulfur, untethered to any other element, resting in the Martian soil. Using a Canadian-built instrument aboard NASA's Curiosity Rover, scientists Dr. Lucy Thompson and Dr. Catherine O'Connell-Cooper contributed to a finding published in Science that reframes our understanding of Mars' deep chemical past — suggesting that sulfur-rich fluids once moved through the planet's subsurface billions of years ago. It is a