Summary: Space Boffins Sue Nelson and Richard Hollingham hear from the Rosetta mission's Flight Director, Andrea Accomazzo, about choosing a landing site on comet 67P - plus Apollo astronaut and last man on the Moon, Gene Cernan, on the spacewalk from hell. Dr Lucie Green from the Mullard Space Science Laboratory and the lab's poet in residence, Simon Barraclough, are the lively studio guests. Expect space poetry, scientific insight and a song about photons.
