CNET reporter Amanda Kooser saw this image in a reddit post on Tuesday. The discussion asked what caused a portal incision on the edge of mars mountain. The scene comes from a series of original images taken by the camera on the mast of curiosity on May 7.
UFO of interest solves images that look like "the entrance to a secret underground tunnel" by sharing a wider landscape. "Looking at it as part of the whole mosaic, we can see that the small groove on the rock is spread all over the rock surface along with other rock blocks, fractures, shapes and other erosive features," UFO of interest tweeted on Wednesday.
Mars images can be tricky. An eroded rock may look like a fish. A backlit cliff may look like the outline of a face. Cropped photos and enlarged views can make tiny features look big. If the shadow happens to fall at different angles, the doorway may be completely unobtrusive.