Mars was always too small to hold onto its oceans, rivers and lakes Space.comThere Could Be an Extremely Simple Reason Why Mars Isn't as Suitable For Life ScienceAlertMars habitability limited by its small size, isotope study suggests Phys.orgIsotope Analysis Reveals a Fundamental Reason Why Mars Has No Liquid Water on Its Surface Today SciTechDailyMars Too Small to Be Habitable, New Study Suggests Sci-News.comView Full Coverage on Google News