Just did a simple google on the subject. Interesting results. Basically the two sites I just visited basically says that empty space, sound will not travel or not travel well. Wow, didnt know that. Yet, the sound does exist. Space isnt a pure vaccuum. There are many floating atoms of gas floating around out there, just not enough to carry sound for the human ear to detect. Using a sensitive microphone, then the sound could be recorded. Hence, a blackhole 250 million light years away is sending out a B-Flat sound that was just recently recorded. Learn something new every day. [thumbup]