Entirely new forms of lightning have been discovered, up to 1,000 times bigger than any previous bolt seen. While normal lightning fires down below clouds, these giant bolts shoot up 80km into space. This lightning, six times more powerful than passenger planes are designed to withstand may be the real killer in a spate of baffling air disasters. And for the documentary revealed the photograph that sparked a secret NASA enquiry. Was this the proof that a high-altitude lightning strike caused the crash of the space shuttle Columbia?
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