https://en.m.wikipedia.org/wiki/Vega_program#Balloon https://en.m.wikipedia.org/wiki/Vega_program#Balloon Two balloons, about 46 hours of endurance, limiting f

https://en.m.wikipedia.org/wiki/Vega_program#Balloon https://en.m.wikipedia.org/wiki/Vega_program#Balloon Two balloons, about 46 hours of endurance, limiting factor apparently being running out of battery power.