Characters played by John Hurt
Self - Narrator
Characters played by Steven Ostro
Self - Radar Astronomer
Characters played by Riccardo Scarpa
Self - Astronomer
Characters played by David Hughes
Self - Astronomer
Characters played by David Spergel
Self - Theoretical Physicist
Characters played by David Kring
Self - Geologist
Characters played by Richard Saunders
Self
Characters played by Jay Melosh
Self - Geophysicist
Characters played by Martin Rees
Self - Astronomer Royal: Cambridge University
Characters played by Robert Farquhar
Self - NASA Missioin Design Specialist
Characters played by Janna Levin
Self - Theoretical Physicist
Characters played by Brian Boyle
Self - Astronomer
Characters played by Matt Genge
Self - Planetary Scientist
Characters played by Donald Brownlee
Self - Astronomer
Characters played by Paul Davies
Self - Astronomer
Characters played by Peter Ward
Self - Geophysicist