I was in the passenger seat driving through coconut grove when I saw a shiny silver orb/sphere object in the sky at a distance. The skies were a clear blue so the object stood out. I saw it over the trees but when we passed taller trees it became shielded. However as we drove forward and were past the tall tress, the object was no longer visible. If it had been a regular aircraft, it should have remained traveling in one direction or another as we passed the tress, but this one just disappeared completely from view.