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The findings reveal that the Martian surface can preserve the kinds of molecules that could serve as signs of ancient life.

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NASA’s Perseverance rover may have stumbled on a visitor from outer space – a strange, shiny rock on Mars that scientists think could be a meteorite forged in the heart of an ancient asteroid.

When the Perseverance rover arrived on Mars nearly five years ago, NASA officials thought the next American lander to take aim on the red planet would be taking shape by now. At the time, the leaders ...