meteorites show Mars was always frozen
http://news.bbc.co.uk/1/hi/sci/tech/4703055.stm describes research on meteorites that indicates the temperature on MArs has always been below freezing point of water.
http://news.bbc.co.uk/1/hi/sci/tech/4703055.stm describes research on meteorites that indicates the temperature on MArs has always been below freezing point of water.