Wild theories have emerged as mysterious "glowing orange orbs" were seen in the sky across parts of the NSW Hunter region.Residents north-west of Newcastle, between Singleton, Cessnock and East Maitland, reported seeing display on Sunday night.The lights appeared in the sky one by one and remained there before later disappearing.READ MORE: Major update for $61bn high-speed train between Newcastle and SydneyThe lights were seen north-west of Newcastle in the Hunter region.