US Air Force flight to Antarctica turns back after space activity warning.

Has anyone seen this article? It sparked my interest so I actually read the article and it only referrs to it as a space hazard. Any idea what a "space hazard" could be? And, one that they'd issue a NOTAM for? Unusual geomagnetic activity? I can't think of anything else that would be prosiac. Then you through Antarctica and it's lore in there... What are your thoughts, theories, and speculations? I find it interesting nonetheless, especially with how many times they refer to "the hazard". EDI...

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