and murray m kramer of mashable. i am pleased to have everyone here. derek is in philadelphia.start with you. it is so good to talk about this. it fascinates so many of us. let me start with this. why was this insertion into jupiter's atmosphere so complicated? >> well, what complicates is it is that first it is going to be a polar orbit. they are trying to set up an orbital path that will allow the spacecraft to avoid the most damaging portions of the magnetic field and radiation field. jupiter being the gigantic planet that it is, has the strongest magnetic field, the worst radiation field you can imagine. we are talking about sensitive electronics in the spacecraft. so what they want to do is to not only get there on time, but to make sure the proper orbit can do all of the scientific examination it has to do and avoids the worst part of the magnetic field as it makes the 37 orbits around the planet. charlie: so you essentially have do construct this armor. >> there are two parts of this. setting up the orbits a you can miss these nasty bouts of radiation. you can physically