I have this same thing. I first noticed it back in Dec 2019 and it happens on and off. I do have porch lights that are on when I see these orbs. I am in the northeast and it's in the 20 & 30's temperature wise. I am suspecting that it may be some kind of insect as the other night I saw an orb with a head & legs on one side of it and it looked like the body part of the insect was the orb. I have to say it is really strange and it seems on the nights that I see them, it goes on for several hours between midnight and 5AM. I might try the insecticide and see if that works.
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