We’ve thrown open the airwaves to you. Marnie Chesterton puts your science questions to Penny Sarchet, Managing editor of New Scientist, Mark Maslin, Professor of Earth System Science at University College London and Catherine Heymans, Astronomer Royal for Scotland and Professor of Astrophysics at the University of Edinburgh.

So, if you’ve ever wondered why planets are round… or what geese are saying to each other as they fly in groups through the sky, listen in for the latest science and some educated hypothesising. Presenter: Marnie Chesterton Producers: Dan Welsh & Debbie Kilbride Editor: Martin Smith Production Co-ordinator: Jana Bennett-Holesworth