Unnatural Hexagon Structure Spotted on Mars

A hexagon shaped structure with a possible dome was discovered in a photograph taken by NASA’s Mars Reconnaissance Orbiter on 17 August 2008.

Multiple disc-shaped objects with classic features similar to the classic flying saucers we are accustomed to here on Earth were discovered, as well as other unnatural looking structures that don’t fit in the surrounding landscape.

Could this be evidence of crashed flying-saucer type craft, or perhaps of a past civilization?

Link to original image taken by NASA’s Mars Reconnaissance Orbiter:
https://www.uahirise.org/PSP_009653_2275