jackie robinson did understand the larger role he was playing. jack johnson wanteox, make money, he wanted to sleep with whomever he wanted, hwanted to live the way he wanted to. in some ways, he's a perfect s erican, but we also have added in our demandr heroism people to be more than that and i think jackie robinson realized and assumed the burden of what hisymbolic act of trotting out to first base on3, april 1947, meant for civil rights. jack johnson wanted no such qualms. he wanted to live well and he did. >> filmmaker ken burns, thank you for being with us. >> thank you. >> woodruff:urns had a lot more to say about race relations then and now. you can find that and more on our website, pbs.org/newshour. >> woodruff: finally, we turn to another installment of our weekly brief but spectacular series. tonight, author and astrophysicist, neil degrasse tyson. for more than two , cades has served as director of the hohayden planetarium in hi town of new york city. tyson's latest book, "aysics for people in a hurry," is available now. >> what i th