Source: http://www.msn.com/en-za/news/other/mysterious-pulsating-ufo-hovers-over-california-for-15-minutes-before-disappearing/ar-AA1EhwgA?apiversion=v2&domshim=1&noservercache=1&noservertelemetry=1&batchservertelemetry=1&renderwebcomponents=1&wcseo=1