the crew talked to the pope about that so-called overview effect, the fact that there are no borders or conflicts visible from space. just one world. and while they see lightning and hurricanes and wildfires and dust storms and northern lights, they see only peace on earth. and there's always a view of earth out their window. and by the way, this calls for a reminder. as space geeks already know, anyone can sign up for text alerts from nasa by entering your zip code here on earth, your phone, they'll let you know when the space station is making its next pass over your area. brightly making its way across the night sky, moving from horizon to horizon in just seconds. it is instantly visible to the naked eye. and on a cloudless night, it's a sight to behold. so that is our broadcast for tonight here on earth. thank you so much for being here with us. good night from all of us at nbc news headquarters here in new