The hypothesis that in antiquity Mars was partially covered by water is now generally accepted in the scientific community.
However, recent data obtained using the Curiosity rover, put her in question.
It all started with the fact that the aforementioned rover discovered in the Gale crater deposits of the lake that existed 3.5 billion years ago. And everything would be fine, only the analysis of the found rocks showed that there are no carbonates in them - consequently, the atmosphere of ancient Mars was extremely poor in carbon dioxide.
This is where the paradox arose. On the one hand, the heat of the Sun, which then radiated 30% less energy than today, was clearly not enough to hold fluid on the surface of the Red Planet. On the other hand, as it turned out, the saturation of the Mars atmosphere with carbon dioxide was also lacking for the greenhouse effect, which is able to hold water in a liquid state.
Thus, the liquid on the surface of Mars could not exist in principle.However, at the same time on the planet there are clear traces of ancient reservoirs.
According to Thomas Bristow, a representative of the Californian NASA Research Center, "the data have driven scientists into a dead end," because now they have difficulty in simulating an atmosphere in which water on Mars would remain liquid.
Now planetologists are trying to somehow coordinate the previously created climate model of ancient Mars with new data.
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