Large humming,, black giant hole in sky above us in back yard with stars around the black circle, then hummed very loud and heard a zip

Bone throbbiing deep noise we both fel,, then the noise built up to a high pitch straight up then we saw the stars again where the black circle was,,, I was 12 and my sister was 14, but I saw the shape before I ran downstairs to get mom first, I got my sister to go out ,,, that's when it happen ,,, I first saw it through binoculars looking at planes coming into Ogden Airport, no one has ever believed us ....I'm 67 yrs old now but can still see ,hear and feel that deep thrumming....and the blank hole over our back yard until the noise and the stars where it was black !!!... I was 12 years old for hells sake!!!!...