30/30 Heather Couper considers the prospects of life being found elsewhere in the solar system.
BBC Radio 4 Extra
29/30 Astronomers in the past decade have tried to find other planets like Earth in the universe
28/30 How the use of infrared telescopes increased our understanding of distant planets.
27/30 Heather Couper looks at research that shows stars are like controlled nuclear explosions.
26/30 Heather Couper looks at William Herschel's discovery of infrared radiation 200 years ago.