Nasa Mars rover: How Perseverance will hunt for signs of past life

Nasa Mars rover: How Perseverance will hunt for signs of past life

Nasa's Perseverance rover, due to launch to Mars this summer, will search an ancient crater lake for signs of past life. But if biology ever emerged on the Red Planet, how will scientists recognise it? Here, mission scientist Ken Williford explains what they're looking for.

extraterrestrial life mars

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