Advanced_Reading

The study in the journal 'Science' was written by NASA scientists.

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This is not the first study to suggest that life existed on Mars in the past.

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A scientific vehicle found very small elements of an organic molecule within water extracted from the planet.

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It is believed that this conclusively proves that there was once life on the planet.

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Methane is a natural molecule that is a sign of life.

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All organic molecules have a limited lifespan.

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Mars can be said to have a winter and a summer.

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There are at least two more scientific expeditions heading to Mars.

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