Thread: What is that, satellites or UFO?

Sometimes when I look in night sky, I can see bright, fast flying objects. What could be these ibjects? UFO's or earth satellites or maybe something else?
(i saw one that in a couple of minutes went from one horizon to another).

If they are not flashing in colours (airplanes), they are satellites. Sometimes, it could also be the ISS. See also:

http://www.heavens-above.com/
http://www.satobs.org/