Giant black triangle goes from horizon to horizon 8 seconds mock 30 or 40 without a sound barley visible

about midnight were are at marathon key Florida talking to my wife i was laying down on a beech chair looking at the sky and on the horizon i saw a black triangle go from 11 o clock to 1 o'clock in about 7 seconds so like mock 30 lol could barley make out the outline of the triangle pointed at it and followed it across the sky it took my wife a few seconds to make it out and see it because of the silhouette and the disappearing stars she told me if i dint point at it with my finger she would have never seen it was enormous and silent no sonic boom it was like a balloon going by at 30,000 miles an hour i guess it could be a giant military drown or something imagine playing asteroids for real and that ship flew by just the silhouette it was like watching a video game from the inside