Circular sand dunes on Mars mystery

Nevermind earthly crop circles, scientists are scratching their heads over these near-perfect round sand dunes on the surface of Mars - see the images here. Space junk: call out for global clear-out action, we speak to University of Plymouth’s Dr Imogen Napper. How fast is London Tube’s new 5G network? Revealed: How dinosaurs grew into giants.

Also in this episode:

• ‘Cut social media by 15 minutes daily for better health’ - study
• Fear of driverless cars increases
• E-scooter rider loses £30,000 crash claim
• History’s most premature twins set world record

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