Name	Known for
Erik Thompson Narrator Narrator See fewer	A Murder of Crows (1998)
Travis Taylor Self - Physicist / Sci-Fi Author (as Travis S. Taylor) Self - Physicist / Sci-Fi Author (as Travis S. Taylor) See fewer	Ancient Aliens (2009)
Alex Filippenko Self - Astrophysicist, Univ. of California, Berkeley Self - Astrophysicist, Univ. of California, Berkeley See fewer	The Universe (2002)
Kevin R. Grazier Self - 'Battlestar Galactica' Scientific Advisor (as Kevin Grazier) Self - 'Battlestar Galactica' Scientific Advisor (as Kevin Grazier) See fewer	Escape Room: Tournament of Champions (2021)
Michael Cassutt Self - Space Historian Self - Space Historian See fewer	Z Nation (2014)
Pamela L. Gay Self - Southern Illinois Univ., Edwardsville Self - Southern Illinois Univ., Edwardsville See fewer	Escape Velocity Space News (2022)
William B. Scott Self - Co-Author, 'Counter-Space' Self - Co-Author, 'Counter-Space' See fewer	Test Pilot (1989)
Karel Urbanek Self - Stanford University Self - Stanford University See fewer	The Universe (2007)
Albert Einstein Self - Physicist (archive footage) (uncredited) Self - Physicist (archive footage) (uncredited) See fewer	Schooling the World (2010)