Episode 2 Stargazing Live: Back to Earth : Season 4 Episode 2

BBC Two int(0)

Aired: March 19th, 2015 @ 9:00 PM EST on BBC Two

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.