This has always been a topic of discussion for many people. Many people go on the verge of searching the truth, but have not been able to verify the real truth about UFO’s. There have been projects launched by authorities but did not seem to gather any significant evidence on them or may be that the evidence is just hard to digest. One can say that whatever done is less known in public. To help you in your search further more, there are
http://www.ufo-sightings-evidence.com that you can check out.