C. R. "Chuck" Downing
shared:
6/24/2017 1:05:02 AM
Reply#SciFact 9/30/2015 Liquid water on Mars! Seasonal wet/dry cycles documented. @SherryFrazier https://t.co/aCuvUUNPUy
— C.R. Downing (@CRDowningAuthor) June 24, 2017