Why NASA, Soviet Union or ISRO never sent Humans on Venus

Venus is the second planet from Sun & it is named after Roman goddess of love and beauty.

Venus is 109 million kilometer away from Sun and possible opposition distance between earth and Venus is 38 million kilometer which is any closed planet to earth.

Farthest ever Venus gets from earth is 261 million kilometer. Light takes 2 minutes and 13 seconds to travel from Venus to earth.

 Venus is also called as Earth's sister planet because of its similar size, mass, proximity to the sun and bulk composition.

Atmospheric pressure at planet’s surface is 92 times that of earth or roughly pressure found is 900 meter under ocean water on earth. Venus is by far the hottest planet in the solar system with a mean surface temperature of 462 degree Celsius which is enough to melt anything.

Venus is surrounded by an opaque layer of highly reflective clouds of sulfuric acid preventing its surface from being seen from space in visible light.

It may have had water oceans in the past but this would have vaporized as the temperature rose, due to runaway greenhouse effect.

Venus surface has slab like rock and periodically resurfaced by volcanism.

 It was the first planet beyond Earth visited by spacecraft Mariner 2 in 1962 and the first to be successfully landed on Venura 7 in 1970.

Venus has its longest day; one day actually lasts longer than one year.

Reaching Venus can take about 2400 hours as it is 38 million kilometer away from earth but finding a landing site is practically impossible.

Venus entire surface is permanently covered in clouds made of poisonous Sulphur dioxide gases, as you anyhow pass through this gases you would be struck by 220 miles per hour winds; 25 miles down the winds subside and you will enter a toxic haze.

Clouds in Venus rain sulfuric acid but the atmosphere is so warm, the rain evaporates in mid air generating smog of sulphuric acid which is nearly 9 kilometer thick.

As you exit the smog, the temperature now is 500 degree Fahrenheit and the pressure is 10 times greater than at sea level here on earth.

By the time you reach the surface the pressure will be 90 times greater the same pressure you feel half a mile under oceans on earth and the temperature is 800 degree Fahrenheit which is hot enough to melt anything.

Now let's say anyhow if you reach down there, exploring Venus would be extremely difficult.

Venuses cloud reflect all of sunlight that hits them so the surface is dim light making it hard to see anything beyond 3 kilometers plus you will need a continuous supply of oxygen. Venus atmosphere is 96% carbon dioxide, 3.5% nitrogen and less than 1% carbon monoxide, argon, sulphur dioxide and water vapor.

Then because of high ultra radiation there is a risk blood & skin diseases.

The only advantage on Venus is that you would only weight 15% less then here on earth.

Until the 20th century that spacecrafts studied about Venus and its faulty behavior. It was only Soviet union who successfully landed its 8 un-crewed spacecrafts on Venus the longest any lasted was just 2 Hours.

 It’s been long since we sent anything to explore Venus surface.

So no country dares to send their representatives on this dangerous planet.