joining me is griff witte and bergen. i am pleased to have both of them. iff, telling what we have learned in this day, which is considerably later where you are. griff: i think there has been a widening and intensification of the investigation today. he started with one additional suspect in custody and we now have eight. five people arrested today in the u.k., most of them in manchester, most of them in the neighborhood where abedi lived. but also in libya, the brother and father of the suspect. the younger brother, was preparing to carry out an attack in tripoli. authorities in libya say they have disrupted the attack. they say he confessed to being part of both the plot in libya as well as having been involved in the plot in the u.k. and to have helped his brother to carry out the attack we saw monday night. charlie: who else was part of a plot? griff: they haven't said. we know the three relatives of the brother have been arrested. the younger brother and the father in libya, as well as the older brother here in manchester. the others, we don't really

griff fri gri witte was with had imwe lost him in the transmission. certainly hope to have him here again. thank you for joining us. back in a moment. >> neil degrasse tyson is here. dr. neil degrasse tyson. he has been described as the most powerful nerd in the universe. and get this, the sexiest astrophysicist alive. how many astrophysicists do you know. he is the director of the world renowned hayden planetarium and an evangelist for scientific curiosity and discovery. he hosts a popular radio and tv show called star talk. his latest book is called astrophysics for people in a hurry it is perfect for me and i'm pleased to have him back at this table. welcome. >> thanks, charlie. by the way, that sex yis astrophysicist, that was 40 pounds ago and 17 years ago just to put that in context. but all right. >> rose: so you were a young dude at the time. >> that was another-- another time. >> rose: who did you write this for, people in a hurry. >> i mean people have jobs, people go to school, you have kids. but if you are still curious as an adult, is the