Comment Re:Care to explain the climate change of Mars (Score 3, Informative) 552
The current theory is that Mars, like Earth, at one point had a molten core that spun, thus causing a magnetic field that held an atmosphere.
The core solidified, stopped spinning, the field collapsed and the atmosphere went its merry way off into space.
In other news, just because your house burned down after getting hit by lightning does not mean it's safe for my 3 year old to play with matches.