Is It Dust or an Orb?

Driving back into Yakima the other night, I was trying to catch a photo of the incredible sunset. But after going through my pics I was surprised to find something else! It looks like a little glowing ball ... maybe an orb? Maybe dust? But it's not in all of them. I had a wonderful day celebrating my grandmother's 90th birthday with friends and family so the mood was peaceful when the photos were taken. Melissa, what say you? :)