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Did the Chicxulub meteor that did for the dinosaurs have a smaller companion? Dr Uisdean Nicholson and Professor Sean Gulick talk to Vic Gill about the newly discovered Nadir Crater. Located on the other side of the Atlantic, it’s raising questions about whether Earth was bombarded with not one, but two, meteors on the day the dinosaurs were wiped out.

Back in January, the Hunga-Tonga Hunga-Ha’apai volcano in Tonga erupted explosively, triggering a massive tsunami across the Pacific. Now, engineers are remotely scanning the volcano from 16,000km away in Essex. Ashley Skett from SEA-KIT International and Dr Mike Williams from NIWA describe how a robotic vessel is mapping the Tongan seabed.

And we get to the bottom of the mystery surrounding a 500-million-year-old fossil…quite literally. The microscopic, fossilised beast, which has no anus, was previously thought to be our earliest known ancestor. Emily Carlisle from the University of Bristol explains how the theory was debunked.

Presented by Victoria Gill
Reporting by Emily Bird
Produced by Alex Mansfield