No.
UFOs are simply things that not readily identified. They are not 'alien' spaceships. Nor do they defy gravity and there are many phenomena that do not make any noise.
They are spaceships used by aliens.
UFO is short for Unidentified Flying Object, not "Alien Spacecraft". People do see things they themselves cannot identify; in that sense UFOs are real, not just possible. Alien spacecraft are possible, but neither aliens nor aliens with spaceships, are in real life, known to exist. Someone has to be the first form of intelligent life in the universe; there is no reason whatsoever to think it isn't us.
no
using UFOS
There is no confirmed evidence in favour of this.
Chasing UFOs - 2012 Alien Cowboys 1-3 was released on: USA: 6 July 2012
Alien Paranormal Bigfoot UFOs and the Men in Black - 2013 was released on: USA: 1 June 2013
Chasing UFOs - 2012 Alien Castaways 1-7 was released on: USA: 10 August 2012
Approximately 72 million Americans (based on 1999 figures). A Roper Poll in 1999 found that 25% of the US population thought that UFOs were alien spaceships. The population of the US in 1999 was 285 million.
Zhon The Alien Interviews - 2012 Orange Juice and Spaceships 3-4 was released on: USA: 20 December 2012
Chasing UFOs - 2012 Alien Baby Farm 1-8 was released on: USA: 17 August 2012