Space Station like object no sound

As I was pulling in my driveway from returning from the store, I looked up in the sky and saw a metallic item kind a shaped like a plane but it didn't really look like one.
It almost reminded me of the Space Station but it wouldn't be in that low of an orbit.
It came over my house slowly without any sound at all the sun was reflecting off the bottom and it's one reason why couldn't really tell what it looked like.
 I live near the airport in Nashville and planes go over and near my house all the time.  This didn't look like a normal airplane. It didn't make a sound at all. As I said they way it went over my house reminded me of the space station but it went over slower than it does.  I watch the space station go over my house all time as I have the app on my phone.
 As I said it went slowly across the sky and all of the sudden it disappeared.  As if it had hit the horizon.
 My husband was standing in the doorway of our front door and asked me what I was looking at and I told him, he was quite skeptical of what I said I was seeing.
Jokingly said it was a UFO which I truly think it was.
 I didn't get any photos as I was stunned and I was entering my driveway returning from the store, just happened to look up in the sky for some reason.