On May 7, 2022, the Mast camera (Mastcam) onboard NASA’s Curiosity rover took a photo which appeared to show a doorway carved into the Martian rock. This image was taken by Mastcam onboard NASA’s Curiosity rover on Sol 3466 (May 7, 2022 at 07:58:16 UTC). Image credit: NASA / JPL-Caltech / MSSS. At first sight, the image from Curiosity is totally convincing. At second sight, maybe not. The passage seems to go in only a short way before the steeply...
