A huge Globe-shaped object is seen at very high altitude-stationary and soundless in the hazy, evening sky of late summer

Early evening, in the late summer. Clear sky, no clouds. Returning from walking to a store in "old" Bellevue, I look up as several airliners, having departed Sea-Tac Airport, one-by-one climb out and turn right over the city. Though there is a high, evening haze, and their altitudes estimated to be between 6,000 and 7,000 feet, the aircraft are sharp in outline and therefore easily identified as to type. (that is they are not so high that the haze obscures detail). Another flies over. I glance up, but in an instant see something else. Something so unlike anything I have seen in the skys, that I do a "double-take". For there, hanging stock still and silent, high-- very high in the haze, so high that only vague detail can be seen--is a huge, globe-shaped object! Perhaps pale yellowish-green, or a light copper color--dificult to tell through that haze. And, while in general it is a ball, the surface appears to be composed of a number of adjoining planes: either triangular in shape or rectangular, or perhaps some other geometric figure, or maybe all three. Again due to the altitude and haziness, I am not sure. In addition, some of the planes appear to protrude beyond their neighbors.
 Staring at the object for perhaps 20 to 25 seconds, I wish that I had my binoculars (I'd gladly have given a $50 bill to've had 'em with me). Then--"Why not? I'll run home, grab them, rush back and have a real llok-see!" Shaking my finger at the thing and shouting, "Stay there. Don't go 'way. I'll be right back!", of I dash. Arriving againat the spot, huffing and puffing after the four-block round trip, I look, but alas--see nothing. Even searching all about several times with the "binocs" reveals only empty, hazy sky. It is gone, dammit!  I return to the location, at the same time, for two successive evenings, thinking that perhaps I had actually seen a giant satellite of some kind. But, nothing is there. No, I did not see a satellite; what I did see (though ever so briefly) was a gigantic USO-- Unidentified Stationary Object--bigger than a football field. Heck, bigger even than the stadium, itself! It may have been 500 to 700 feet, or perhaps much greater, in diameter; furthermore, at an altitude of at least 30,000 to 40,000 feet, it looked to be about the size of a dime when held at arm's lenth. Yet, at such a height; therefore, so far up in the haze, I could still just make out htos adjoining and interlocking planes which made up its surface.
Date of sighting is approximate.  The witness is well known to us, and we consider him to be highly credible.  PD