Scientists ponder whether ice on Mars ever melted

LOS ANGELES - The apparent discovery of ice near Mars' north pole has scientists asking: Did the frozen water melt at some point in the planet's long history to create an environment friendly for life?ADVERTISEMENTThe Phoenix spacecraft exposed bright white crumbs at the bottom of a trench while digging near Mars' north pole earlier this week. The bits disappeared in new photos sent back on