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View From A High Altitude Balloon
Flight 2 is a project that takes photos from a high altitude balloon using GPs, camera, sensors and communications. The risk factor for this is that the precious electronics could be lost if anything malfunctions.
The FAQ answered one of my questions though - the danger that it pose to manned aircrafts. There is an aluminium foil inside the capsule for radar reflection so control towers would have been able to track it. In terms of legality, it is permitted for that weight without requirements to notify any authority. Hit the link to check out the launch videos and various photos at Natrium 42.
Link: Natrium 42
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