NASA's Opportunity rover has started exploring Endeavour Crater and is examining a rock type that is has not been seen before on Mars. Known as Tisdale 2, the flat top rock is of interest as it appears to have volcanic properties as well as other characteristics. The crater is providing a whole new area of exploration.
Read More ABout It: http://www.jpl.nasa.gov/news/news.cfm?release=2011-274
and also check out http://www.esa.int/esaSC/SEMM71VTTRG_index_0.html
Sky Guy in VA - P.S. Hope to see Apollo 18 this Labor Day!