A Nasa astronaut duo marooned on the International Space Station discover they may not return to Earth until 2025. Plus, Finlay Asher, from aviation industry climate impact campaign group Safe Landing, on airline pollution, regulation and aircraft engine tech developments.

Also in this episode:

• Gene-editing therapy for blood disorder recommended on NHS
• Army space radar base in Wales 'to combat cosmic warfare'
• Did this 500-year-old compass belong to Copernicus?
• Scientists make Caesar’s perfume...no gladiator sweat available

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