Huge entrance in the mountainside on Mars

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On todays "NASA search", this orbiter image revealed its secrets when the Zoom and enlarge process started.  

This is from PIA 19129 Mars Reconnaissance Orbiter (MRO)

When the "zoom process" started this rectangular hole appeared, It looks like there is a enforced frame aorund it also, and notice the big object "parked" outside the entrance.  This hole must be milewide. Range to target site: 273.8 km (171.1 miles) see original Nasa link 

See the video

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Nasa link. . http://photojournal.jpl.nasa.gov/catalog/?IDNumber=pia19129

Nasa Info link on this image.: http://hirise.lpl.arizona.edu/ESP_038851_1900

The frame around the hole is marked with red arows, The yellow line is pointing out an object "parked" outside the hole. Notice the little weird shaped thing on top of the object.!

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