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Researchers from the University of Washington have developed a computer model of Earth that simulates the planet’s evolution without the influence of life. The study, published in The Planetary Science Journal, aims to help astronomers distinguish between planets that appear habitable and those that truly harbor biological activity. The model tracks the development of Earth over a five-billion-year span, covering the period from its formation approximately 4.5 billion years ago to 500 million years into the future. By simulating the exchange of chemical substances between the planet’s core, mantle, crust, surface, and atmosphere while excluding the impact of living organisms, the researchers created a baseline for geological evolution. During validation, the model successfully reproduced 19 planetary characteristics, including heat flow through the mantle. According to the study authors, this model can be adapted to study rocky exoplanets outside our solar system. The researchers emphasize that the detection of water or an atmosphere suitable for life does not confirm the presence of organisms. To draw more definitive conclusions, scientists must determine which chemical signatures can be produced solely through geological processes. On Earth, living organisms continuously release oxygen and methane. Because these gases react with one another, their simultaneous presence in an atmosphere suggests a constant replenishment of resources. However, to interpret such signals reliably, astronomers need to compare their observations against models of planets where life is absent. This new tool will allow scientists to test whether the atmospheric composition of a distant world can be explained by geological processes alone. If observational data cannot be reconciled with the model, the planet may become a primary candidate for further investigation. Additionally, the researchers expect the model to assist in the design of future telescopes specifically intended to search for biosignatures on exoplanets. Article source: News.am | Image credit: News.am
Researchers from the University of Washington have developed a computer model of Earth that simulates the planet’s evolution without the influence of life. The study, published in The Planetary Science Journal, aims to help astronomers distinguish between planets that appear habitable and those that truly harbor biological activity. The model tracks the development of Earth over a five-billion-year span, covering the period from its formation approximately 4.5 billion years ago to 500 million years into the future. By simulating the exchange of chemical substances between the planet’s core, mantle, crust, surface, and atmosphere while excluding the impact of living organisms, the researchers created a baseline for geological evolution. During validation, the model successfully reproduced 19 planetary characteristics, including heat flow through the mantle. According to the study authors, this model can be adapted to study rocky exoplanets outside our solar system. The researchers emphasize that the detection of water or an atmosphere suitable for life does not confirm the presence of organisms. To draw more definitive conclusions, scientists must determine which chemical signatures can be produced solely through geological processes. On Earth, living organisms continuously release oxygen and methane. Because these gases react with one another, their simultaneous presence in an atmosphere suggests a constant replenishment of resources. However, to interpret such signals reliably, astronomers need to compare their observations against models of planets where life is absent. This new tool will allow scientists to test whether the atmospheric composition of a distant world can be explained by geological processes alone. If observational data cannot be reconciled with the model, the planet may become a primary candidate for further investigation. Additionally, the researchers expect the model to assist in the design of future telescopes specifically intended to search for biosignatures on exoplanets.
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