“Something not from the Earth,” he said.
He knows this how?
He knows it's not from earth at another time?
He knows it's not from same planet, different universe?
He knows it's not from a secret Nazi colony under the Antarctic ice?
He knows it's not a monster from the id álà Forbidden Planet?
He knows it's not some sort of spoofing or hitherto unrecognized meteorological phenomena?
He knows its not an unrecognized aerial life form?
Ghosts? Demons? Angels? Buddhist monks deep in meditation? Remote viewers?
He knows everything.;-)