For the moment, the National Aeronautics and Space Administration (NASA), has not commented on this fact, but it is most likely that it is a fracture in the rock by an earthquake or some natural event.
On May 4, NASA’s InSight Mars probe recorded the largest recorded earthquake on another planet, with a scale of 5, in the unit that is recorded on earth.
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Since 2018, when the probe arrived at the red planet, there have been recorded approximately 1,313 earthquakesthe previous record was held by a move of approximately 4.4.
This may be one of the reasons how this “door” was formed, while there are other speculations that it may be a psychological phenomenon, called memory-prediction, in which the computer engineer, Jeff Hawkins, says that the human brain can perceive an uncertain image with a recognizable shape.
We will have to wait for some official response, to find out if we are facing an extraterrestrial test or it is simply a rock with a crack, meanwhile more images sent by Curiosity will continue to be known, which brings us closer to knowing our neighboring planets better.