Hesperian
... that during the Hesperian, Mars changed from a wet, warm world to today's dry, cold, and dusty planet?
... that during the <b id="mwCM0"><a class="mw-redirect" href="./Hesperian_(Mars)" id="mwCM4" rel="mw:WikiLink" title="Hesperian (Mars)">Hesperian</a></b>, <a href="./Mars" id="mwCM8" rel="mw:WikiLink" title="Mars">Mars</a> changed from a wet, warm world to today's dry, cold, and dusty planet?