Silvery opaque cylindrical shape with no wings, gliding slowly and silently across a perfectly blue sky.

I was laying in the grass in Trexler Memorial park looking up into a perfect blue sky, watching a puffy cloud lazily roll by. I happened to look a bit south west and notice a cylindrical shape with no wings, gliding slowly and silently in the blue sky heading south. I could see that it had 2 slight protruding portions near the front and rear. It was almost like a light silver color but appeared a bit opaque. I had to concentrate while staring at it to keep seeing it's shape from merging into the blue sky. I could see contrails from a couple of further away airplanes since the park is near the Lehigh Valley Intl airport. But this thing didn't have any kind of exhaust signature or sound which is what made it weird. After about 10 or 15 seconds of tracking it, I found it was hard to see the outline against the blue shy and it just disappeared. It didn't go fast or anything like that, it just sort of blended into the sky. I looked around and didn't see anyone else looking up into the sky and pointing so I eventually went home. A friend of mine told me about this site and suggested that I file a report.