Something traversed between my wife and I about 4 feet off the ground that made an unidentifiable noise and the speed of which was extraordinarily fast. Neither of us place any credence in "Aliens among us" or visitations...The physics against such things are irrefutable. My career was in astronomy on top of Mauna Kea in Hawaii, my wife was a banker and accountant...What ever it was created a distortion in the air between us for an instant. We live in a suburban area and our residence is surrounded by a Fir forest. To the right of me from whence "it" came is a 150 meter tall hill about 50 meters away which we also own..Aside from the noise of the event there was absolutely no report one might ascribe to the discharge of a fire arm...our area is for the most part dead quiet. If it were a bullet etc. "it" would have to be able to climb a 150 meter tall hill, go over the top then descend to our level and go absolutely parallel to the ground between us. I have been reluctant to "report" this because of my own core beliefs, however one of my friends encouraged me to do so anyway..I have a home observatory (a Meade 12 inch LX200) and do a lot of observing hunting for NEOs...I have yet to see anything inexplainable either here or on top of Mauna Kea...Having said that, the event my wife and I witnessed not only frightened us but left us with profound curiosity as to its origin...The distortion in the air between us looked as if we were looking through water...The noise was subtle but unlike anything we have ever heard.. I own guns and know a ricochet when I hear one...Am I alone in this???