When I watched the launch of the Nasa Grail Moon Mission on September 10, 2011, I was only about 5 miles from the actual launch site. From what I understand, that was about as close as we could get that day.
One thing I noticed was that after liftoff, it took the sound several seconds to reach where we were at. I think someone calculated that it took 25 seconds. As I remember that moment, it was like a rush of loud sound that vibrated the ground, the air and each one of us. You could feel it just as clearly as if you felt a raindrop.
The other thing I noticed was that right after the sound, it was like there was a vacuum created with virtually no sound. It was a peaceful sound and feeling. However, this lasted almost long enough to realize it, but it vanished almost instantaneously.
