Scientists suspect Mars might have caves

http://www.playfuls.com/news_006144_Scientists_Suspect_Mars_Might_Have_Caves.html

Mars Odyssey has taken pictures of black spots on mars, and scientists now believe that these black spots may be caves and not impact craters. It is estimated that these caves are the size of football fields. This is exciting because if life exists on mars, it is very likely that it will be found in caves, because the insides of the caves are protected from radiation.