I came down to sit at my friends terrace. As i was waiting for him and smoking cigarette my head was up looking at the sky.

Immediately an object flew by at very high speed and high altitude (over 25,000feet) by my estimate.  Having a teardrop shape, and white or silver color.  Fat side of teardrop facing the direction of flight.  It flew past my visual range in about 3 seconds.  My head turned as i followed it from left to right..that’s all the time i had.
I am not sure what it was,  it could not have been a balloon or a bird in a dive as it had a very distinctive shape and the trajectory never changed.  It went in a straight line.
It was travelling at such a high speed yet there was no sonic boom and there was a no disturbance to the air around it.  Weather was clear not a single cloud and the sun was shining bright behind me.
 Honestly. I have no idea what it was and im a logical person. It was not a balloon, bird, kite, helium balloon, airliner, fighter jet, angel , meteor, satellite, there was no engine exhaust, chemical trail, vortices, air disturbance of any kind..it was cutting through the air at very high speed, yes faster than a fighter jet at full throttle with afterburner.
Witness elects to remain totally anonymous; provides no contact information.  PD