Name	Known for
Marc Aaronson Self Self See fewer	Nova (1974)
George H. Bell Self Self See fewer	Nova (1974)
Alec Boksenberg Self Self See fewer	Nova (1974)
John Gatenby Bolton Self (as John Bolton) Self (as John Bolton) See fewer	Nova (1974)
Andrew Carnegie Self (archive footage) Self (archive footage) See fewer	Our Mutual Girl (1914)
Owen Gingerich Self (as Professor Owen Gingrich) Self (as Professor Owen Gingrich) See fewer	Cosmos (1980)
George Ellery Hale Self (archive footage) Self (archive footage) See fewer
Edwin Hubble Self (archive footage) Self (archive footage) See fewer
Milton Lasell Humason Self (archive footage) (as Milton L. Humason) Self (archive footage) (as Milton L. Humason) See fewer
Henrietta Swan Leavitt Self (archive footage) (as Henrietta Leavitt) Self (archive footage) (as Henrietta Leavitt) See fewer
Ted O'Brien Narrator Narrator See fewer	Where Are the Children? (1985)
Brendan Parsons Self (as Brendan Parsons 7th Earl of Rosse) Self (as Brendan Parsons 7th Earl of Rosse) See fewer	Nova (1974)
Maarten Schmidt Self (archive footage) Self (archive footage) See fewer
Harlow Shapley Self (archive footage) Self (archive footage) See fewer	Of Stars and Men (1961)
Dennis Walsh Self Self See fewer	Nova (1974)
James Adolf Westphal Self (as Jim Westphal) Self (as Jim Westphal) See fewer	Horizon (I) (1964)
Peter Young Self Self See fewer	Nova (1974)