Betz Mystery Sphere: From a Florida Discovery to Theories of Alien Artifact Versus Industrial Valve

To the point

Antoine, Jerri, and Terry Betz found a roughly bowling-ball-sized, 7.96-inch-diameter, 21.34-pound silver sphere on Fort George Island, Florida in March 1974 that reportedly hummed and rolled; the Navy said it was a hollow stainless steel ball valve with three internal spherules, while J. Allen Hynek, James Harder, and skeptics like James Durling-Jones offered a range of extraordinary and mundane explanations, and its current whereabouts remain uncertain.