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Venus is the only planet in the Solar System that rotates in the opposite direction to all the others. While Earth and the other planets rotate counterclockwise from west to east, Venus has a retrograde rotation caused by the influence of its extremely dense atmosphere. A study published in Nature Astronomy explains that the Sun’s gravitational pull on Venus’s deformed atmospheric masses created a torque that reversed its rotation over billions of years. One day on Venus is equivalent to 243 Earth days, and the surface temperature reaches 475°C.
Venus is the brightest planet visible from Earth, but it is also the strangest in the Solar System. While all other planets rotate counterclockwise when viewed from the North Pole, Venus rotates in the opposite direction, clockwise, completing a rotation on its own axis every 243 Earth days. This retrograde rotation makes Venus an anomaly that has intrigued astronomers for decades until a study published in Nature Astronomy revealed the responsible mechanism: the planet’s atmosphere is so dense that the Sun’s gravity acting on it managed to reverse the entire rotation over billions of years.
Researcher Kane, cited by Nature, described the experience of being on Venus’s surface with a comparison that dispenses with technical explanations: “It would be like being at the bottom of a very, very hot ocean, reaching temperatures of up to 475°C.” The atmospheric pressure on Venus’s surface is 90 times greater than that of Earth, equivalent to the pressure found at 900 meters deep in the Earth’s ocean. It is this massive atmospheric mass that made the inversion of the planet’s rotation possible.
Why Venus rotates in the opposite direction
The explanation accepted by the scientific community lies in the interaction between Venus’s dense atmosphere and the Sun’s gravity. The planet’s atmosphere is so thick and heavy that it forms masses deformed by the solar gravitational attraction, creating a friction or torque effect that, over billions of years, slowed down the original rotation and completely reversed it.
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According to the Jornal da USP, this mechanism works because Venus’s atmosphere does not perfectly accompany the planet’s rotation. It deforms in response to the Sun’s gravity, and this deformation creates a drag force that acts against the rotational movement. There is an alternative theory, little accepted by scientists, suggesting that Venus was hit by another celestial body that altered its original trajectory. However, the giant impact hypothesis is considered unlikely because it would not explain the extreme slowness of the current rotation.
The numbers that make Venus unique in the Solar System
Venus’s rotation is so slow that a day on the planet lasts longer than a year. A full day on Venus, the time to rotate once on its axis, is equivalent to 243 Earth days. Its orbit around the Sun takes 225 Earth days, according to NASA Science. This means that Venus completes a full orbit around the Sun before completing a single rotation on itself.
Seen from the North Pole, Venus is the only planet in the Solar System with clockwise movement. In practice, if someone could survive on Venus’s surface, they would see the Sun rise in the west and set in the east, exactly the opposite of what happens on Earth. The combination of retrograde rotation with extremely slow speed makes Venus a world where the concept of “day” and “night” has completely different dimensions from what we know.
What it’s like to be on Venus’s surface
The surface of Venus is the most hostile environment of any rocky planet in the Solar System. The average temperature on the surface is 475°C, hotter than Mercury, which is much closer to the Sun. This temperature is high enough to melt lead and zinc, and it remains practically constant between day and night because of the thick atmosphere that retains heat extremely efficiently.
The atmospheric pressure on Venus’s surface crushes any equipment not specifically designed to withstand it. The few probes that landed on the planet, the Soviet Venera in the 1970s and 1980s, survived between 23 and 127 minutes before succumbing to the heat and pressure. Venus’s atmosphere is predominantly composed of carbon dioxide with clouds of sulfuric acid, creating an uncontrolled greenhouse effect that explains why the planet retains so much heat.
What Venus teaches about Earth’s future
The study of Venus’s rotation and atmosphere is not just astronomical curiosity. Venus likely once had oceans and habitable conditions billions of years ago, but the uncontrolled greenhouse effect turned the planet into an oven that evaporated all the water and created the dense atmosphere that now reverses its own rotation.
For scientists studying climate change, Venus is the extreme example of what can happen when the greenhouse effect goes out of control. Earth is not at immediate risk of becoming Venus with its 475°C, but the fundamental mechanism is the same: greenhouse gases trap heat, warm the atmosphere, and alter the planet’s conditions. The case of Venus demonstrates that these processes, once initiated, can become irreversible on a geological scale.
Did you know that Venus rotates in the opposite direction to all other planets and that a day there lasts longer than a year? What impresses you the most: the inverted rotation, the 475°C temperature, or the pressure 90 times greater than Earth’s? Tell us in the comments.
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