Several amber spheres hovering silently

Driving towards Bangor through Levant when I noticed 2 amber spheres hovering over a farm about 300 feet off the ground. Silent, did not move. I observed for 5 minutes while driving. I stopped at a store at a 4 way intersection to look at the objects. They disappeared. I continued home and observed a third object over a field on the Bangor line. This was a single orange sphere. It too dissappeared. This is a military flight path the spheres were hovering on.