Izzie Clarke is joined by Dr Robert Massey to tackle your questions on the shape of space, measuring gravitational waves and planet spotting. We also have another - another! - astronaut: Producer Richard chats to British ESA astronaut Rosemary Coogan about her background as an astrophysicist.

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The Supermassive Podcast is a Boffin Media production. The producers are Izzie Clarke and Richard Hollingham.

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BONUS - What Shape is Space?