Guest Stars Daniel N. Baker as Himself (Professor - University of Colorado, Boulder) Thomas Huffman as Himself (Archaeologist, University of Witwatersrand) Dr. Kerry Lee as Himself (Dr. Kerry Lee - NASA Space Radiation Analysis Group) Dr. Jürgen Matzka as Himself (Dr. Jürgen Matzka - GFZ German Research Center for Geosciences) Dr. Lisa Nip as Herself (Biologist, Massachusetts Institute of Technology) Dr. Zarana Patel as Herself (Dr. Zarana Patel - NASA Space Radiation Analysis Group) Prof. John Tarduno as Himself (Geophysicist, University of Rochester) Prof. Craig Underwood as Himself (Prof. Craig Underwood- Surrey Space Center) Col. Terry Virts as Himself (Former NASA Astronaut) Dr. Mike Watkeys as Himself (Archaeologist)