Tom Service presents a special edition on Welsh musical life. (R)
1/5 Dr Stuart Clark argues that humanity must leave Earth and set up outposts on other worlds.
Including Dadaism, an exhibition about time, and the celebrity as a 'national treasure'.
2/5 Archaeologist Cameron Smith on future ages of humanity as it heads for worlds beyond Earth
Prue Shaw, Sean O'Brien, Nick Havely and Kevin Jackson discuss Dante's The Divine Comedy. (R)
3/5 Professor Rachel Armstrong examines the challenge of building a living starship.
Playwright James Graham discusses his new comedy, which puts Screaming Lord Sutch on stage
4/5 Author Stephen Baxter considers the perils of freedom and conflict beyond Earth.
A special time travel edition, featuring William Gibson, Sally Rodgers and Ira Lightman. (R)
5/5 Astronomy writer Dr Stuart Clark asks where all the aliens are.