If there are aliens then we are aliens too. I don't believe that there are aliens if ever there are possibilities that there are aliens I would believe that they are still human not some scary and weirds creatures just like what we see in movies.

What about: do the aliens believe in you?

maybe .. because nothing is impossible and there are a lot of things we do not know in this universe

all things that we thought impossible in the past is a reality of our hands now

Absolutely, I see them occasionally shopping at Wal-Mart.  I've also seen them at Home Depot and Burger King.  They don't speak English, and I can't quite understand their language; but I think that they are plotting to take over the world.

"Intelligent" life has never been observed on the third planet from the Sun, but maybe it exists elsewhere. 

WOW signal!   http://www.youtube.com/watch?v=pcSWDzd2cDU

Try to explain the distances involved to anyone who ever states that he or she believes Earth has been visited by extra-terrestrials. I think the closest star (alpha centauri ???) is hundreds if not thousands or millions of light years away. According to Einstein's currently accepted doctrines of physical laws, an object cannot travel faster than the speed of light. Therefore, it would take probably thousands of years for another species to reach our planet. Actually, hundreds of thousands of years, because that is the closest star. I don't know the distances of the stars they've determined to have planets, and more specifically, those planets they think could possibly harbor life. (I think they determined stars have planets by measuring the gravitational pull these planets exert on their mother star, or something similar with light or something)