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john mather is the senior project scientist for webb at nasa's goddard space flight center in greenbeltland. >> the universe is known to be expanding. we've known this for almost a century. the distant galaxies are running away from us. and what that means is the wavelengths that we get from them are longer. so the farther out you look in space, the more stretched these waves are, the more infrared they are. so, to see farther than the hubble can see, you have to have a telescope that can pick up the longer wavelengths. >> reporter: what do you think webb will find? >> the webb is so powerful that, if you were a bumblebee hovering at the distance of the moon from earth away from the telescope, we would be able to see you. so, you know, if you're out there, we'll find you. >> reporter: but getting webb out there to its perch in space is a tall order. it will lift off from french guiana on an ariane rocket built by the european space agency. a few days after launch, the telescope is slated to start unfolding, origami style. i's an intricate two-week deployment filled with mission- threate