Space probes have witnessed a big impact crater being formed on Mars – the largest in the Solar System ever caught in the act of excavation.

A van-sized object dug out a 150m-wide bowl on the Red Planet, hurling debris up to 35km (19 miles) away.

In more familiar terms, that’s a crater roughly one-and-a-half times the size of London’s Trafalgar Square.

Scientists detected the event using the seismometer on the US space agency’s InSight lander. The probe picked up the ground vibrations.

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