hohosforbreakfast writes "According to CNN, NASA launched the largest single-cell, fully-sealed balloon ever from Australia. This thing is supposed to be as large as a football (American) stadium once it's fully inflated, and flies 20 miles high. It'll circumnavigate the globe and then be landed by remote control in Australia. It looks like this flight is a proof-of-concept, but more flights, lasting 100 days each, are planned. Looks like an interesting alternative to satellites for certain observations. The official site is here."