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Home Scientists from NASA’s Mars 2020 and ESA’s ExoMars projects study stromatolites, the oldest confirmed fossilized lifeforms on Earth, in the Pilbara region of North West Australia. The image was taken on August 19th, 2019. (NASA/JPL-Caltech) Scientists from NASA's Mars 2020 and ESA's ExoMars projects study stromatolites, the oldest confirmed fossilized lifeforms on Earth, in the Pilbara region of North West Australia. The image was taken on August 19th, 2019. (NASA/JPL-Caltech)

Scientists from NASA’s Mars 2020 and ESA’s ExoMars projects study stromatolites, the oldest confirmed fossilized lifeforms on Earth, in the Pilbara region of North West Australia. The image was taken on August 19th, 2019. (NASA/JPL-Caltech)

Scientists from NASA's Mars 2020 and ESA's ExoMars projects study stromatolites, the oldest confirmed fossilized lifeforms on Earth, in the Pilbara region of North West Australia. The image was taken on August 19th, 2019. (NASA/JPL-Caltech)

Scientists from NASA’s Mars 2020 and ESA’s ExoMars projects study stromatolites, the oldest confirmed fossilized lifeforms on Earth, in the Pilbara region of North West Australia. The image was taken on August 19th, 2019. (NASA/JPL-Caltech)

This image shows the finely layered internal structure of a stromatolite from the Pilbara Craton in Western Australia. (NASA/JPL-Caltech)