5 faits surprenants sur la planète Vénus

Une image fraîchement traitée de Vénus, compilée en 1974 à partir des données du vaisseau spatial Mariner 10. Auteurs : NASA / JPL-Caltech

Que savez-vous de la planète[{” attribute=””>Venus? Venus resembles the planet earth so much they’re called sister planets because of similarity of size and density, although Venus is 20% smaller in mass. Because of the reduced mass of the planet and weaker gravitational pull, you’d weigh 20% less when standing on Venus relative to earth. However, the earth offers a far more hospitable environment, so it’s best to observe Venus by telescope. In fact, Venus is one of the quirkiest planets in the solar system. Here are some reasons.

1. Time is Strange on Venus

A day in planetary terms depends on how long it takes for the planet to rotate one time around its axis. On earth, it takes 24 hours. But on Venus, it takes the equivalent of 243 Earth days for Venus to make a complete rotation around its axis. A year, in contrast, represents how long it takes for a planet to revolve one time around the sun. Venus does that in 224 days. It’s strange but true; a year is shorter than a day on Venus. If you could somehow survive and live there, years would pass faster than your days and you would be constantly confused about what time it is.

Venus Akatsuki Mission

Image of Venus acquired by the Akatsuki mission, the first Japanese probe to enter orbit around a planet other than the Earth. Credit: ISAS/JAXA

2. The Heat is Overwhelming

Venus and earth may be similar in size, but the temperatures on Venus make it far less hospitable. According to NASA, the temperatures on Venus are fiery hot, enough to melt lead. Imagine what they could do to you. Why is it so hot on the earth’s sister planet? Venus’s atmosphere is composed of almost 96% carbon dioxide, with a small amount of water vapor. These greenhouse gases keep heat from leaving the surface of Venus, so the surface reaches a temperature that isn’t survivable, with temperatures between 460 and 880 Fahrenheit. Even spacecraft melt after only a few hours on Venus.

3. Venus Will Crush You

If you can survive the extreme heat on Venus, the odds against survival even short term are non-existent. The reason? The air pressure is 90 times greater than it is on earth, the equivalent of the pressure you would experience if you journeyed 3,000 feet underwater. In other words, the atmospheric pressure of Venus will crush you right away should you end up there. Not that you’d want to visit anyway!

Venus Global View Magellan Mapping

This global view of the surface of Venus is centered at 180 degrees east longitude. Magellan synthetic aperture radar mosaics from the first cycle of Magellan mapping are mapped onto a computer-simulated globe to create this image. Data gaps are filled with Pioneer Venus Orbiter data, or a constant mid-range value. Simulated color is used to enhance small-scale structure. The simulated hues are based on color images recorded by the Soviet Venera 13 and 14 spacecraft. Credit: NASA/Jet Propulsion Laboratory-Caltech

4. Venus is a Bit “Backward”

Another strange thing about Venus is its rotation. Planets and even asteroids rotate in a counterclockwise direction. That’s why on earth the sun rises in the east and sets in the west. Things are backward on Venus; the planet rotates in a clockwise direction around its axis and the sun rises in the west and sets in the east. In fact, Venus is the only planet in the solar system that spins clockwise. They do things a little differently out there.

5. Venus Looks Lovely from Afar

If you viewed Venus through a microscope, you would think it’s the loveliest of planets, a beautiful light in the sky. Because of its proximity to earth, Venus appears bright and radiant in the sky. So inspired were early astronomers by the apparent beauty of earth’s sister planet that they named it after Venus, the Roman goddess of beauty and love. However, if you got closer to its surface, you would see a myriad of deep craters and mountains. You’d also see thousands of volcanoes ranging in size from quite large to very small. In fact, it has more volcanoes than any other planet, the largest being Sapas Mons. The volcanoes play a major role in shaping its surface.

Magellan Venus Surface

Surface features of Venus from the Magellan mission. Credit: Magellan Team/JPL/USGS

The Bottom Line

If Venus looks beautiful in the sky, but it’s not a place you’d want to visit even for a brief time, nor could you survive it. The best way to admire it is with a microscope.

Vénus, voisine de notre planète, est un monde chaud, infernal, impardonnable, et la NASA a choisi deux nouvelles missions audacieuses pour explorer cette planète aux allures d’enfer : DAVINCI + et VERITAS. Vénus et la Terre sont-elles des mondes fondamentalement uniques ? Ou les différences entre ces “jumeaux” sont-elles purement cosmétiques ? Répondre à cette question est essentiel pour comprendre ce qui rend les autres planètes rocheuses vivables et finalement émerger avec la vie. Crédit : NASA

La NASA retourne sur Vénus. En savoir plus sur les missions DAVINCI+ et VERITAS.

En savoir plus : Les 10 énigmes étonnantes de Vénus

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