skull01-676x450In continuing speculation about life or structures found on Mars, one UFO blog is claiming to have found an “alien skull” on the Red Planet. UFO Sightings Daily posted images–some of which are digitally altered–of the so-called skull (The site appears to be down Wednesday; here’s the cached page). It was taken from a NASA photo captured by the Mars Spirit rover at the Gusev Crater. It seems more likely that it’s just a rock that somewhat looks like a skull. But the blog then digitally added “teeth and [a] lower nostril bone.” More