Neil deGrasse Tyson/ Michael A. Strauss/ J. Richard Gott/ Michael Butler Murray (NRT)
(2)
Neil deGrasse Tyson/ Dion Graham (NRT)
(1)
Neil deGrasse Tyson/ Mirron Willis (NRT)
(1)
Neil deGrasse Tyson/ Vikas Adam (NRT)/ Piper Goodeve (NRT)/ Allyson Johnson (NRT)/ Nick Sullivan (NRT)
(1)