UFO Sighting in Urmston, on December 15th 2015 – three glowing spheres in sky

I have seen them previously two years earlier in a different location and asked on Facebook if anyone had seen them. Two years later my husband and I were sat watching TV when he pointed the orange light moving in the sky it was followed by two others after approx. A min apart. He is a non believer but was unable to explain this. They couldn't be lanterns as there were three following a direct line and could hear a hum.