I saw a roundish, kind of out of focus white sphere, that eventually disappeared before my eyes.

I had dropped a friend at the Indianapolis airport and was driving back to my home in Watson, IL. I was traveling west on Interstate 70 and was approaching Terre Haute, Indiana. I suddenly noticed a white, roundish object in the sky ahead. It was almost like it was out of focus because it didn't seem clear. I was wearing sunglasses, so I quickly took them off because I thought I would be able to see it better. It actually made it less clear though. My sunglasses were polarized so for whatever reason, the polarization of the glasses made it clearer. I put them back on and watched the object for maybe 30 seconds or so as I drove. It wasn't clear to me though, almost like it was hazy or out of focus or something. As I was watching it, it suddenly blinked out of existence!! I put the time I saw it at 6pm, but it could've been anywhere between 5-7pm. I can't remember exactly when I dropped my friend at the airport, but it was definitely in the evening before it got dark or even before the sun was noticeably going down.