Dr Stu and Mark are joined by a tableful of friends for a chat about all things universe-y.

In episode 6, Stu and Mark discuss the moon, exciting goings-on at the Large Hadron Collider, answer listener questions, play 'Stuniversity Challenge' (aka Big Fat Galactic Liar Quiz), talk about the perils of asking the public to name things, and dwell briefly on Mark's new beard... and Matt Damon's poo (the two are unrelated).

We're back! And we're talking about the BIG new discoveries, how light pushes things around, Australian microwaves and how to do a wee in space. Plus some other, more serious stuff.

In Episode 4, Dr Stu tells Mark about Tim Peake's space walk, rumours of gravitational waves, civilisation-threatening meteors and NASA'S obscene pictures!

In episode 3, Dr Stu tells Mark about Alien Megastructures, the likelihood of Alien life, the moving Northern (and Southern) Lights and we play round 3 of the Big Fat Galactic Liar Quiz. Additional music in this episode by Jon Shearer.

In this extra episode, Dr Stu reviews the latest Star Wars Blockbuster with Mark's 7 year old son, Oscar. CONTAINS SPOILERS!

In the first of their new regular fortnightly episodes, Dr Stu and Mark talk about Tim Peake, Star Wars and the Death Star, the far side of the moon, and Stu's missing trousers. You can tweet your questions and comments to @immarkosullivan or @DrStuClark

A little introduction by Mark & Dr Stu.

In the first of a new regular podcast, comedian Mark O'Sullivan chats with Dr Stuart Clark, Astrophysicist, Journalist, Novelist and Broadcaster. In this episode... Einstein, Space Planes, Orbital Litter, Star Wars, Dr Stu's Big Fat Galactic Liar Quiz and a try-it-at-home Space Mystery! Tweet your questions to @DrStuClark or @immarkosullivan