Anybody know how they got the images back down to earth?
"At over 100,000ft the balloon lost its inflation and the equipment was returned to the earth.
"We travelled 10km to find the sensors and photographic card, which was still emitting its signal, even though it had been exposed to the most extreme conditions."
I launched about 50 balloons of varying inflation levels and groups (i.e. 1,2, and 3 balloons) and attached ribbons to them and tied laminated index cards with a numeric-ID and my email address.
I ended up getting a few responses and I believe one of the single balloons traveled over 76 miles before setting down in someone's backyard. The average was something like 50 miles, and that was on a warm night with <5mph wind.
We launched thousands of baloons with index cards, once a year, in primary school but I never received a reply from any of mine.
It's definitely fun though!