Water Etchings in Western Mexico Sands On 18/05/2016 By MikaelaIn NASA Image of the Day Expedition 47 Flight Engineer Tim Kopra of NASA posted this May 15, 2016 photograph to social media, writing, “Water etchings in western @Mexico sands. @Space_Station #Explore” via NASA http://ift.tt/1rTZdCW Share thisFacebookPocketWhatsAppTumblr Related