A spherical bright light spot that moved faster than planes at that altitude.

I was on flight NK2060 MCO-BOS seating on 25A (window on Port side of the plane) enjoying my vacation. The descent had already started and we were around 15 minutes from landing. I estimate the altitude should be around 6000 feet. I was looking at the window and recognizing other Aircraft models that passed by (I like to do that since I work at an airport and I’m interested in planes). I recognized several of them, but suddenly I saw this spherical object reflecting very bright white blueish light going SW direction. I mean it passed in the opposite direction we were heading and I could see it for about 7 seconds and I didn’t have enough time to grab a camera. It passed by us I would say not more than 1 mile below and 1 mile East and moved at at least double speed of other aircrafts.
It had nothing to do with any aspect of an aircraft.