UFO's

Okay as I said in my other post i am really interested in UFO's and my teacher asked me a very interesting question and that is do I think that they are among us or on other planets and to tell you the truth i am not really sure about it because there is proof that they could be among us on earth in hiding hey you never know they could be walking in the streets with us. Then again there is some theories that they might not be able to get to earth and that if they can it would take thousands of years because they most likely live in basically different galaxy's that are light years away but to tell you the truth no one knows. If you were to ask me i would say because of all the evidence we have such as video tapes,photo's,and physical evidence that they are among us in bases and another reason i might disclose the theories is that we don't know how far ahead in technology they may be the could have devices out there that could warp time and space itself that gets them here in a fairly fast time.