Do we actually know for sure that mars had a molten core, and dynamo, and megnetosphere. I thought that was as muddled up as the old thoughts that the darks spots were jungles?
I've seen it mentioned on multiple documentaries about Mars, not ones about Aliens either, having had those things earlier; can't say how they came to those conclusions but these people can figure out a lot from a little so I'm inclined to give them a doubt. Either way the planet had running water, i.e., surface temperatures were once above 0 degrees. The theory I remember was when the core solidified the magneto-sphere weakened, increased solar-rads damaged the atmosphere and as it disapated the temperature fell and all water was fozen at the poles.
Makes sense no?