What do you think about UFO?

People are really curious when they hear something about alien, objects that are strange or unusual seeing, especially some objects that people think they are not on Earth. Perhaps these objects are signals, shuttles,jet, or even lights. I have read some new about evidences of existing alien outside of Earth on Yahoo news, March 7, 2011. That scientist have found evidences of lives outside of Earth is on a part of a rock from outside of Earth. This causes my belief is more accurate that there could be something living out there among billions and billions stars, planets, and solar systems that are the same with our solar system.