White sphere materializes out of vapor trail.Around June 16th, I was out in my backyard talking on the phone to my friend. This is something I do all the time. I live fairly close to the Boise Airport and I see planes coming in all the time. I also watch them fly over all the time on their way to other locations.In my backyard that day as I was watching an airplane that clearly was not landing in Boise because it was I would guess about a half a mile away in the sky. I was watching this airplane fly over and away from me and I always watch the vapor trail dissipate as I was doing on this day.As the trail broke up into clumps and evaporated one of the clumps did not evaporate and was in fact a perfectly round white ball. It looked like a giant ping-pong ball hanging there. I thought that was odd that it was so round and did not evaporate like the rest of the trail. As I stood there watching it I was trying to figure out what it could be, I have never seen anything like that and I had a light bulb moment and got excited because I was thinking oh cool I’m seeing a weather balloon.However, as I kept staring at this object it did not ascend, or descend it literally just stayed in one spot so I ruled out weather balloon. I stood there watching it for about another couple of minutes and then it just was gone. It just disappeared instantly. It was a clear, sunny day and there was nothing around this object after the trail evaporated. It was very interesting, so I thought I would share.I am a stay at home mom and a student currently studying for my degree in education. I am a down to Earth person and do not go around looking for spooks and such. I thought what I saw was very strange and I could not identify what it was, not only that but the fact that it just stayed there and appeared out of the vapor trail of the airplane gave me pause. This airplane was a passenger jet heading East flying over the south-east part of Boise.((ADDENDUM FROM WITNESS))Hello, I apologize for the mix up with the dates. I was wrapped up with my daughters upcoming wedding. I remember it being a Thursday as I was speaking to my best friend about her leaving the upcoming Sunday to drive up to Boise. I hope this helps you and thank you for the email. Sincerely, ((name deleted))((END ADDENDUM))((NUFORC Note: We have changed the date above. PD))((NUFORC Note: Witness indicates that the date of the sighting is approximate. PD))