Well, perhaps the answer to the enigma is none of these, as it appears our early explorers were similarly baffled by such strange sounds seemingly emanating from clear night skies.
Accounts from early explorers and settlers of hearing strange sounds of unknown origins in our skies were published in Phenomenal Sounds in the Interior of Australia - Are They Terrestrial or Atmospherical? - a pamphlet by Mr T. Gill from a report of the deliberations of the Australasian Association for the Advancement of Science, held in Melbourne in December 1913.
'"I am somewhat diffident in submitting to the geographical section of this association the following particulars, chiefly obtained from explorers' journals and personally from explorers and old bushmen who have traversed the interior of Australia," Gill wrote. "I do not presume to offer any explanation as to the cause of the phenomena reported here, but humbly submit the reports and opinions of various travellers on the mysterious sounds which are of frequent occurrence in certain localities, and which bewilder all who have heard them."













