Satellite Photos Reveal Hidden Alphabet on Earth's Surface

It started with a plume of smoke in the shape of a ‘V’ on an image of Earth taken by one of NASA’s satellites. Soon it grew into an addictive hunt for more letters, made out of glaciers, storms, lakes and craters. For years, NASA science writer Adam Voiland has been on the lookout for letter-shaped natural phenomena, combing through thousands of satellite images slowly collecting the entire alphabet and chronicling it in an online gallery. It was a hit, and soon Voiland was back for a second round, collecting another entire alphabet, this one all capitals, for a new children’s book, ABCs from Space. More

(Source: National Geographic - Sep 20)