Friday , February 3 2023

Research results that “the sea did not exist on Venus in ancient times” -GIGAZINE


In the solar systemMercuryNext to the sunVenusIs now a hard planet with high temperature and pressure, but “Once upon a time, Venus had a sea and a warm climate.There is also a theory that. However, a new study simulating the environment of “Venus and Earth more than 4 billion years ago” found that “Venus has never had an ocean in its history since its birth.” ..

Day-night cloud symmetry occurs early oceans on Venus but not on Earth | Nature

Did Venus ever have oceans? | EurekAlert!

There is no way Venus could ever have oceans, astronomers say

Venus has a strong greenhouse effect because the main component of the atmosphere is carbon dioxide, the surface temperature reaches almost 460 degrees, the atmospheric pressure near the surface of the earth is about 90 atmospheres, and the air is a thick cloud of concentrated sulfuric acid . It is a hard planet covered with. On the other hand, Venus has the closest orbit to Earth and is similar in size and average density.Terrestrial planetThat is why it is also called “the sister planet of the earth”.

In recent years, space agencies in every country have paid attention to Venus.The rush of Venus exploration can arriveIs also indicated. One of the reasons for this is that when the sun was younger and darker than now, Venus was not so hot, and it was a planet warm enough for the ocean to exist. It is expected that important hints will be given to the conditions of birth.

Standard solar modelAccording to the Sun, 3.5 billion years agoIt was only about 75% of the currentIt is said that in the pastResearchSuggests that Venus may have had a sea under these circumstances. However, if the sun were 25 to 30% darker than now and emitted less heat, the earth away from Venus would have been an ice globe, but at this time the earth had liquid water. There is evidence that it existed.

So SwitzerlandUniversity of GenevaPostdoctoral fellow in astronomyMartin TurbetHis research team decided to seek an answer to this question by simulating “the early Earth and Venus climate more than 4 billion years ago.”

The research team simulated the ancient Venus and the Earth’s environment with sophisticated three-dimensional atmospheric models similar to those used by meteorologists to simulate the Earth’s climate and future changes …

As a result of the simulation, it was found that water at that time existed in the form of steam on Venus due to the high temperature, and the whole planet became like an enormous pressure cooker. Venus had to be cooled for thousands of years before the vapors in the atmosphere condensed into clouds and rained on the surface. Cooling only occurs when clouds that block the sun’s rays are formed, but it seems that the clouds are only formed on the cooler night side on Venus, which does not prevent the sunlight from reaching. night side and heat all over Venus.

As a result, the researchers conclude that on Venus steam did not rain and fell on the surface, and did not create an ocean. On the other hand, instead of turning the earth into an iceberg, it seems that the planet has cooled down well and the water has become liquid and the sea is made thanks to the darker sun than in modern times. If the earth was a little closer to the sun when the sun was stronger, the earth would not cool, so the dark sun was happy for the earth.

Co-author of the treatise, professor of astrophysics at the University of GenevaEmeline BolmontHe pointed out that the darkness of the sun billions of years ago was called the “weak and young sun paradox” and was considered an obstacle to the birth of life on earth. “But I realized that this faint sun might have been a miserable opportunity for life on a very hot planet,” he said.

“Our results are based on theoretical models and are an important factor in answering the history of Venus, but we can not fix the problem on our computer. Our work,” said Bolmont. To confirm or deny the future (NASAWhenDITNeeds observations required of three Venus space missions (which is being considered). “

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