Dr Roger Noble from the Jodrell Bank Centre for Astrophysics came and spoke to us about the biggest possible questions: cosmology, the big bang, relativity, how we learnt that the universe is expanding, whether it will continue to do so or start imploding under its own gravity, and how we have tried to confirm our hunch that the cosmological constant (lambda (Λ)) is exactly 1 – the value required to make the universe continue to expand, but only just. Dr Noble’s talk was really clear, carefully paced, and eye-opening.