i want to bring in charles lieu, and leroy chow, a former nasa astronaut. charles, you hear what ed was talking about three miles away and one of the things that stood out was that as he watched this and when five seconds in, when the explosion happened, he felt the earth shake. >> yes. that is quite expected. there is a tremendous amount of fuel load. as the previous commentators had been saying. from what i could see from here and my rocket science is -- the expert can be much more expert about it, but it seems that the rocket simply stopped. the thing kind of went up and straight back down again. it wasn't a wild, crazy, for example, spiraling rocket going out of control. so it does seem like something just cut off, either the rockets themselves or the fuel to the rockets stopped and started going elsewhere. but that much fuel, making the ground shake, is a perfectly normal thing to happen. and it is very fortunate for nasa to take the proper precaution and the wallops island launch site is just over the atlantic ocean and they go over the atlantic so the