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Venus was possibly habitable to a mysterious event

Now Venus is a mostly dead planet with a 90 times thicker toxic atmosphere and surface temperatures of 864 degrees, which are hot enough to melt lead. It is often called the twin of the earth because the planets are of similar size. But the modern comparisons stop here.

However, a recent study compared five climate simulations of Venus' past and each scenario suggested that the planet could support liquid water and a temperate climate on its surface for at least three billion years. Like the other planets in our solar system, Venus formed 4.5 billion years ago.

These temperatures could have been a maximum of 122 degrees Fahrenheit and a minimum of 68 degrees Fahrenheit.

Between 700 and 750 million years ago, something triggered the release of carbon dioxide from rocks on the planet and changed its climate.

"Our hypothesis is that Venus may have had a stable climate for billions of years, and perhaps the near-global event is responsible for transforming an Earth-like climate into a hellish hothouse we see today." said Michael Way, study author at the Goddard Institute of Space Science. Way presented his study this week at the European Planetary Science Congress 201
9 in Geneva.
Previously, Way wrote a study on climate and oceans on Venus in 2016.

The ocean was the first proposed by the NASA Pioneer Mission in the 1980s. However, since Venus is the second planet in front of the Sun, it was not considered conducive to the preservation of an ocean.

  Was Venus once habitable?

Venus receives more sunlight than Earth, which evaporates liquid water, sends hydrogen into space, and traps carbon dioxide. This would lead to a permanent greenhouse effect that would create the current toxic atmosphere. The topography of Venus has been completely altered by volcanic eruptions, most likely occurring in lowland and potential ocean basins over the last billion years.

Of the five simulations, three contained the current topography of Venus, adding a depth of 1,017 feet to the ocean, a shallow 32-foot ocean, and traces of water in the ground. The researchers compared this with two other simulations that used an Earth topography with a deep ocean and an oceanic world.

To restore the probable conditions on Venus, which occurred 4.2 billion years ago and changed over time, they gradually increased the solar radiation to reflect the sun as it warmed. This also changed the atmospheric conditions over time.

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Previously, researchers believed that Venus is too close to the planet Sun to get liquid water on its surface beyond the inner boundary of the sun-drivable zone. The new simulations change that belief for Way and his colleagues.

"Venus currently has nearly twice the solar radiation we have on Earth, but in all of the scenarios we modeled, we found that Venus can still tolerate surface temperatures suitable for liquid water," said Way.

The simulations suggest that Venus went through a rapid cooling phase a few billion years after its formation. Then the atmosphere would have been full of carbon dioxide. If Venus had evolved similar to Earth, that carbon dioxide would have come from the atmosphere, attracted to silicates, and trapped in the surface. This would allow the atmosphere to be filled with tiny amounts of carbon dioxide and methane with nitrogen, providing stability.

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