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In the vast Martian desolation, the astronaut stands alone, gazing at the reddish horizon from the base dome.
He has spent months analysing soil and rock samples, searching for clues to the origin of life on Earth, but with no apparent success.
Until one day, while examining an ancient sample under a microscope, he sees it: an intricate molecular chain, as tiny as it is complex, that doesn't seem to match anything known on Earth.
Excited, he performs a series of tests and analyses, and the results are astonishing.
These molecules are the fossilised remains of a unique, incredibly ancient microbial life form, dating back to the dawn of the solar system.
But most striking is their similarity to terrestrial DNA, suggesting an ancestral link between the two worlds.
He has uncovered compelling evidence that life on Earth has been seeded from Mars, transported through space in rock fragments ejected by meteoric impacts billions of years ago.
The cradle of humanity is not on Earth, but on the mysterious red planet.
With trembling hands, he transmits his findings to Earth, knowing that he has forever rewritten the story of the origin of life.
From the window, he gazes out at the Martian landscape with new eyes, realising that this desolate world holds the deepest secrets of human existence.