19.
An 11-month controllable balloon flight
A design change accidentally produced what the author calls the longest-flying controllable atmospheric vehicle in history, lasting more than 11 months
@johndeanl on Backlist
2 appearances on the backlist front page in the last 30 days.
20.
WindBorne's planetary balloon constellation
A team under 100 people is operating a global network of weather balloons as live infrastructure, with each dot on the map representing hardware in the sky