"Mountain of Mystery" -- Mars' Mount Sharp at Gale Crater
“To me, Mars is the uncanny valley of Earth,” said planetary geophysicist Kevin Lewis of Johns Hopkins University. “It’s similar but was shaped by different processes. It feels so unnatural to our terrestrial experience.” In a 2019 paper in Science, NASA researchers detail how they repurposed sensors used to drive the Curiosity rover and turned them into gravimeters, which measure changes in gravitational pull. That enabled them to measure the subtle tug from rock layers on lower Mount Sharp, which rises 3 miles (5 kilometers) from the base of Gale Crater and which Curiosity h...