Charles F. Bolden Jr.

饰：Himself - Space Shuttle Pilot, Hubble Launch Mission STS-31

John Grunsfeld

饰：Himself - NASA Astronaut, 1992-2009

史蒂芬·霍金

Stephen Hawking

饰：Himself - Cosmologist

Barbara Mikulski

饰：Herself

Lou Montagnino

饰：Himself - Optical Engineering, Perkin Elmer

Charles Pellerin

饰：Himself - Director of Astrophysics, NASA, 1983-1992

Bud Rigby

饰：Himself - Optical Manufacturing, Perkin Elmer

John Trauger

饰：Himself - Principal Investigator, Wide Field & Planetary Cameras

尼尔·德格拉塞·泰森

Neil deGrasse Tyson

饰：自己

Heidi Hammel

饰：Self - Planetary Astronomer, MIT, 1990-1999

Jeff Hester

Jeff Hester

饰：Self - Wide Field & Planetary Camera Teams, 1985-1998

Story Musgrave

饰：Self - Capsule Communicator, STS-31,Self - NASA Astronaut, 1967-1997

Chris Burrows

Chris Burrows

饰：Self - Telescope Scientist, European Space Agency, 1984-2000,(as Christopher Burrows)

John M. Grunsfeld

饰：Self - NASA Astronaut, 1992-2009,(as John Grunsfeld)

Ed Weiler

Ed Weiler

饰：Self - Hubble Chief Scientist, 1979-1998