Hey guys, I am no scientist (I am studying advertising at uni), although I am terribly interested in it. My highest scientific learnings was highschool; but I did take physics, math c, biology, chemistry. Anyway, I am in no way qualified so my point is bear with me and don't hate ;) I was just pondering tonight and I was thinking about space, aliens and other stuff you think of at night :P And I got to wondering, my crude knowledge of sound is it is vibrations of air that our ears then turn pick up, turn into electrical signals, and our brains translate. Now I know, or am assuming (incase it has been disproven and I don't know :) ) that there is no sound in space because there is no air. So on other planets, where the air is different, is sound then different? On mars is sound higher pitched or lower? And just being far fetched, but assuming an alien environment is so unlikely to be exactly the same as ours, would an alien be even able to hear us - or us them. But I accept stupid questions deserve stupid answers. So if this is stupid to you, apologies and flame away.