'Monolith' on Mars?

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The image was captured by the HiRISE camera onboard the Mars Reconnaissance Orbiter, a NASA space probe a few years ago. It appears to be a rectangular upright stone. Some believe that it was intentionally planted by aliens, but many others believe it is just a piece of rock that broke off of a near mountain, rolled down it, and ended up sticking into the ground there. Jonathon Hill, a research technician and mission planner at the Mars Space Flight Facility at Arizona State University believes it is nothing more than a boulder. What do you think?

Sources: http://www.lifeslittlemysteries.com/, http://news.yahoo.com/