At 21 mile (34 km) high in the sky, things start to develop a bit risky for high-altitude balloons. The atmospheric air pressure is so low that the gas inside the balloon swells. Triggering exactly what has shown in the picture.
|Image Credit: Kostas Tamateas via Kosmas's Facebook Page|
The image was taken as measure of the SlaRos project, Greece's first suborbital photography task. The balloon burst over the Thessalian Plain of northern Greece. Mount Olympus can be seen underneath the clouds at the top left. And to the instant left of the balloon, or what's left of it in any case, is the Aegean Sea. See video of the balloon bursting at 4:26 below.