The fact that they've been reported as ghosts doesn't automatically mean they're the lingering spirits of deceased once-living mortals. It means that whoever perceived them and made the report interpreted their qualities to be ghostlike.
For all we know, they could be living energy beings who just happen to resemble what we think of as ghosts.
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For all we know, they could be living energy beings who just happen to resemble what we think of as ghosts.