and derek cramer. thank you so much. thank you all very much. ♪ mark: i'm mark crumpton.atching the "bloomberg west." we begin with a check of your first word news. president obama traveled. to dallas, texas today where he met with the families of the five officers killed in last week's ambush. he discussed the burdens placed on officers in the line of duty. president obama: from the moment you put on that uniform, you have answered a call that at any moment, even the briefest interaction may put your life in harm's way. >> the white house says

are chief astronomer and plantarrian director for the franklin institute derek pitts, lauren grush of the verge and marian cramer of mashable. i am pleased to have everyone here. derek is in philadelphia. derek, so good to see you again and talk about this because it fascinates some of us. let me start with this, derek, why was this insertion into jupiter's atmosphere so complicated? >> well, what complicates it is first it's going to be a polar orbit situation and they're trying to set up an orbital path to allow the spacecraft to avoid the most damaging portions of the magnetic field and the radiation fields of jupiter, jupiter being the gigantic plant et has the strongest magnetic and worst radiation field you can imagine and we're talking about sense tye electronics in the spacecraft so they want to not only get it there on time and at the right location so they can get it into the proper orbit but they can sure the proper orbit sets up the spacecraft so it cannot only do all the scientific examination it has to do but also aadvised the worst part of the magnetic field and the radiation ield as it makes the