chunks of the instrument mount and heavy batteries would have made it to the ground. but likely they fell over the ocean or luckily for us, canada is sparsely populated and it didn't hurt anybody. maybe we'll find some of that debris as people scour that countryside or randomly find it. but my guess is most fell in the ocean. >> heather: in terms of this particular satellite, it was launched in 1991. a little of the background there. there has been some changes that have happened since then to protect us even further from something like this happening? >> new satellites are designed with enough rocket fuel to deorbit themselves and take themselves into the atmosphere in a controlled reentry over the open ocean. urs was designed in the '80s. it did not have the fuel margin to bring itself back in a controlled reentry. but nasa lowered it to get it into the upper reaches so it would come down faster, getting out of the way of other useful satellites. >> heather: i don't have a whole lot of time left, but i have to ask you about this: this