I should point out, that at no point do you have to take us at our word; it is well within your ability to do a little Googling to corroborate what we say with the internet, your nearest university, and each other (since we all seem to have posted this at the same time).
Another question: How can we messure the distance to stars with trigonometry - we only know one angle!! I think i asked this before but didn't follow up the answer!!
Basically what we do is we take a picture of the night sky when the Earth is at one point, and then we do the same 183 days later - i.e. when it's on the other side of the sun. This distance is roughly 300 million kilometers, and the distance moved means that the stars move as well. How much they move depends on how far away they are from us - the closer they are, the more they move. Stars that do not move at all between pictures are too far away for the distance to be measured correctly.
Stellar parallax was known for hundreds of years, and was actually one of the
scientific objections to heliocentrism - it was inconceivable that the stars were so far away that they did not move at all to the human eye when the Earth orbited. Of course, they do move, but they are so far away that most parallax calculations are done by satellites (probably the most famous one is the Hipparcos satellite (that produced the Hipparcos Catalogue of stars).
For more distant objects we can use the red-shift that Hubble found, and analyzing the emission spectrum of the object in question, and comparing it to what we know it is made of. The amount of red-shift is a rough indicator of distance.
Because you made that up!
I don't buy that either, because you made it up too or didn't you!?
Is this about the exhaled air feeling cold? Yeah, Wiccan is right. You can test this for yourself. Purse your lips, and exhale strongly onto the back of your hand (not someone else's

). Then, in mid-exhale, open your mouth wide, being careful not to change how fast you're breathing out. You'll notice that when you open your mouth wider, the air travels slower, and does not evaporate as much water off the skin, so it feels warmer than when you purse your lips and the air has to travel fast to get through a smaller opening.
Your response is common, though. The same principle is the origin of a myth in Korea and Japan; they think that leaving a fan on while you sleep will kill you because of hypothermia, because fans cool you down. In fact, they don't. They just make sure that the air in the room is more efficient at evaporating moisture off your skin.