exaggerating. >> that's right. we had a big conference in 1989 about to launch the hubble space telescope, but wa do we do for an encore? 30 years later, we have the answer. james webb is the most powerful space telescope ever built going up tomorrow morning. the whole astronomy community is on tenterhooks. >> i know they are. i think you'll have a hard time sleeping tonight, my friend. walk us through why this mission is so important. like, i've been raepding about exoplanets, i don't know what those are. what will it tell us? >> right. one of the key things that james webb wants to do is look at the very first galaxies and stars. and so hubble gives us good pictures of galaxies that are by astronomer standards nearby,