Perseverance rover's Mars samples show traces of ancient water, but NASA needs them on Earth to seek signs of life

image via Space.com

February 13, 2025, 6:46 PM

• •Perseverance's soil samples contain millimeter-sized grains from at least two different regions on the Red Planet
• •The samples will help scientists learn more about Mars and Earth
• •Bringing samples back to Earth will allow for far more detailed study using more advanced lab equipment

NASA's Perseverance rover has been busy gathering bits of Mars — rock cores the size of chalk sticks, clusters of broken fragments no bigger than pencil erasers, and even grains of dust fine enough to sit on the tip of a needle. Now, scientists are preparing for the next step: cataloguing these samples before potentially bringing them home with NASA's Mars Sample Return program. While NASA is still weighing its options for bringing those precious bits of the Red Planet home, scientists have documented in a recent study what they know so far about the first samples of soil, regolith, and loose sediment collected by the Perseverance rover. The researchers found that Perseverance's soil samples contain millimeter-sized grains from at least two different regions on the Red Planet that show signs of past water exposure and possible habitable conditions. Though the data looks promising, the team won't be able to confirm whether any traces of microbial life are present until the samples are back on Earth.

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