Elon Musk called this Falcon 9 explosion "the most difficult and complex failure." A careful analysis of the valuable Launch Report video - possibly the only usable visual record of the failure - seems to reveal the location, equipment involved, and possibly also suggests an ignition source for the primary explosion.
Here we consider in more detail the possibility of atmospheric electricity as an ignition source of an accidental explosive mixture. We also look at what could be done to prevent it from happening again.
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