rachel. don, first to you. what do you think of this scene? >> i am completely jazzed by this. and the first thing i would like to say as a scientist, i would like to congratulate the technical and scientific staff at nasa and jpl. great job. >> and what's just happened? we know it landed on mars. tell me more. >> well, now the next step is to shake out the equipment, deploy the solar panels. then there are three different missions that "insight wi" will. one is to test the wobble of mars' rotation, to find out something about the core of mars. another one will be to deploy a very sensitive seismograph to look for mars quakes and when meteors hit mars, to find out more about its interior. and finally, and perhaps the most exciting, is to drill down 16 feet underground to actually take the temperature of the planet. and that will teach us something