1) Mars has no magnetosphere; it's core is dead. So, there's nothing to protect a new atmosphere from being eroded by the solar wind any more than the old one was protected. 2) There is no ozone layer or water to filter out the ultraviolet radiation that sterilizers the surface.
-
-
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.