The US military is testing stratospheric balloons that ride the wind so they never have to come down

https://www.technologyreview.com/s/612417/darpa-is-testing-stratospheric-balloons-that-ride-the-wind-so-they-never-have-to-come-down/

A sensor that can spot the wind direction from miles away will let DARPA’s surveillance balloons hover at the very edge of space in one spot indefinitely.


Original Title: The US military is testing stratospheric balloons that ride the wind so they never have to come down
Full Text of the Original Article: https://www.technologyreview.com/s/612417/darpa-is-testing-stratospheric-balloons-that-ride-the-wind-so-they-never-have-to-come-down/