Tweet link to my initial observation: https://twitter.com/gigalisk/status/1199092754141323265 This object was definitely occupying the restricted airspace above Miami International Airport, highlighted in the Miami-Dade County document located here (http://www.miamidade.gov/govaction/legistarfiles/MinMatters/Y2015/152396min.pdf). That's what struck me as strange. This rounded object was traveling at a constant rate of speed, moving southwest - located roughly east and very high over the main building. The higher up things look (or further away from the viewer in any direction), the slower that they appear to be moving (subtending a smaller angle). That is why for the distance that i perceived the object to be away from me, i found it very strange for something to move THIS FAST. I couldn't track it for a picture using my iPhone. On top of that, for something to be moving that fast and within sight, it would have to make a TREMENDOUS amount of either noise, or exhaust; of which it made neither. The fastest thing in the sky that I have ever witnessed is an F-22 doing a Hi-speed pass at Full Afterburn over Langley Air Force base back in 2005. I may not have heard it approaching but i saw it, and once it passed, i was suddenly hit with the shockwave it left behind. Whatever this was did not make a single sound, nor did it leave any trail of exhaust. It was roughly 515pm, 25th November - so the sun was going down and beacon lights should be visible on any aircraft around this time; this aircraft had no beacon lights that are visible on ANY AIRCRAFT, including DRONES - which led me to believe that whatever was flying, could not be doing so with the prior knowledge of any aviation authority. Let me recap. Observed as a fast moving controlled object with no visible markings or identification. No observable exhaust trail or engine noise. Moving south arbitrarily through a restricted airspace.