With the solar eclipse just hours away, Dara O Briain, Brian Cox and special guest experts are back at Jodrell Bank to answer viewers' questions. Apollo 11 astronaut Buzz Aldrin is on hand to explain why he believes humans must walk on the surface of Mars.
| Name | Type | Role | |
|---|---|---|---|
| Lucie Green | Guest Star | ||
| Alexander Kumbar | Guest Star | ||
| Chris Welch | Guest Star | ||
| Buzz Aldrin | Guest Star | ||
| Ian Russell | Director |