How to colonize Venus, and why it's a better plan than Mars

Venus: Hot, toxic, hellish... home?

How to colonize Venus, and why it's a better plan than Mars
A digital elevation map of Maat Mons, a five-mile-high volcano surrounded by lava flows on the surface of Venus. Image: NASA.
  • When we think of colonizing space, our first thoughts are to the Moon and Mars.
  • Venus, despite being incredibly inhospitable on the surface, might actually be a better target for colonization.
  • Suspending blimps in the Venusian clouds is not only feasible, but offers some of the most Earth-like conditions in the solar system.

Venus, the second planet from our sun, is a downright terrifying place. Its atmosphere is almost all carbon dioxide, with the exception of the clouds that rain sulfuric acid. Its surface is a foggy, yellow desert dotted by volcanoes many times larger than those found on Earth. Its mean surface temperature reaches a blistering 860 degrees Fahrenheit. But despite these inhospitable conditions, Venus may be one of the best spots for humans to settle in our solar system.

Settling on a hellish planet

An artist's rendering of the surface of Venus.

ESA/NASA

While the two may not seem alike at first blush, Venus is quite similar to Earth compared to other planets in our solar system. So much so, the Morning Star is sometimes called Earth's "sister planet". Its gravity is 90% as strong as Earth's, compared to Mars' ~38%, meaning that our muscles won't atrophy, and our bones won't decalcify as they do in low-gravity environments. It's roughly the same size as Earth, and it's the closest planet in our solar neighborhood.

This makes Venus a tempting target for future colonization, but what about all of those deadly characteristics mentioned above? It's hard to imagine life in an atmosphere full of carbon dioxide, with no water, and at incredible heat. Not to mention that if you were to stand on its surface, the weight of the Venusian atmosphere would be the same as diving 3,000 feet underwater (which you don't want to try). There's no arguing that the surface of Venus is brutal. That's why we wouldn't live on Venus's surface.

Instead, a hypothetical Venusian colony would be suspended by blimps floating 31 miles above the surface. This might seem farfetched, but it isn't entirely science fiction. While there are plenty of challenges associated with living above the surface of Venus, in many ways, establishing a colony in the clouds of Venus would be easier than doing so on the surface of Mars. Here's why.

Paradise in the clouds

In Venus's upper atmosphere, the pressure would be about 1,000 hectopascals (hPa), which is extremely close to Earth's 1013 hPa at sea level. Not only will humans be able to tolerate this exceedingly well, but since the pressure outside a blimp would be close to that inside the blimp, any punctures would result in a repairable leak rather than a catastrophic explosion. As an analogy, you can consider this like opening the door to an airplane on the runway compared to doing so during a flight. Above the surface's crushing pressure, the temperature would be much more manageable, too, ranging from 32 to 122 degrees Fahrenheit.

These qualities mean that a human could happily work outside the habitat, so long as they had air to breathe and protection from the clouds of sulfuric acid. Acid rain might seem like a problem, but there are plenty of easily constructed materials resistant to such acid, like polytetrafluorine—also known as Teflon.

What about water? Venus barely has any, unfortunately. But those deadly clouds made of sulfuric acid also present an opportunity. Sulfuric acid is made of hydrogen, sulfur, and oxygen molecules. Through electrolysis, these molecules can be separated and recombined to form water, leaving only sulfur as a waste product. As for oxygen, Venus has an abundance of carbon dioxide and nitrogen, which can be used to grow plants for producing breathable air and food.

Venus' atmosphere would also provide shielding from cosmic radiation, which can both scramble human brains over time and irradiate food, soil, and pretty much everything else. Mars, unfortunately, has a very thin atmosphere, which would not provide this benefit.

Full-scale colonization

JAXA/NASA/Lockheed Martin

It's nice to know that exploring Venus through manned missions is possible, but our long-term goal of becoming an interplanetary species and establishing a colony must be more challenging. Generating the lift for entire cities to float in the Venusian clouds seems like it would be a monumental feat of engineering. To be sure, it would be hard, but not quite as hard as one would think.

Geoffrey Landis, a NASA scientist and science-fiction author who studied the feasibility of human colonies on Venus, explained that floating a city 31 miles above the planet's surface would be relatively straightforward. Because Venus' atmosphere is mostly carbon dioxide, a mixture of oxygen and nitrogen—the regular air you're breathing now—could easily generate the necessary lift. "A one-kilometer diameter spherical [balloon] will lift 700,000 tons—two Empire State Buildings. A two-kilometer diameter [balloon] would lift six million tons," writes Landis.

What's more, Landis says, "Venus has plenty of room. A billion habitats, each one with a population of hundreds of thousands of humans, could be placed [to] float in the Venus atmosphere."

Of course, none of this will be happening any time soon. While this colony would work in theory, we still need to learn more about Venus. Mars takes up much of the limelight in our interplanetary exploration, while most missions to Venus were made decades ago by Soviet probes. NASA does have a plan for a 30-day crewed mission to Venus called the High-Altitude Venus Operational Concept (HAVOC), but this project is sadly inactive. As we gear up to establish colonies on the moon and on Mars, however, hopefully we keep our sister planet in mind.


Golden blood: The rarest blood in the world

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Abid Katib/Getty Images
Surprising Science
  • Fewer than 50 people worldwide have 'golden blood' — or Rh-null.
  • Blood is considered Rh-null if it lacks all of the 61 possible antigens in the Rh system.
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China's "artificial sun" sets new record for fusion power

China has reached a new record for nuclear fusion at 120 million degrees Celsius.

Credit: STR via Getty Images
Technology & Innovation

This article was originally published on our sister site, Freethink.

China wants to build a mini-star on Earth and house it in a reactor. Many teams across the globe have this same bold goal --- which would create unlimited clean energy via nuclear fusion.

But according to Chinese state media, New Atlas reports, the team at the Experimental Advanced Superconducting Tokamak (EAST) has set a new world record: temperatures of 120 million degrees Celsius for 101 seconds.

Yeah, that's hot. So what? Nuclear fusion reactions require an insane amount of heat and pressure --- a temperature environment similar to the sun, which is approximately 150 million degrees C.

If scientists can essentially build a sun on Earth, they can create endless energy by mimicking how the sun does it.

If scientists can essentially build a sun on Earth, they can create endless energy by mimicking how the sun does it. In nuclear fusion, the extreme heat and pressure create a plasma. Then, within that plasma, two or more hydrogen nuclei crash together, merge into a heavier atom, and release a ton of energy in the process.

Nuclear fusion milestones: The team at EAST built a giant metal torus (similar in shape to a giant donut) with a series of magnetic coils. The coils hold hot plasma where the reactions occur. They've reached many milestones along the way.

According to New Atlas, in 2016, the scientists at EAST could heat hydrogen plasma to roughly 50 million degrees C for 102 seconds. Two years later, they reached 100 million degrees for 10 seconds.

The temperatures are impressive, but the short reaction times, and lack of pressure are another obstacle. Fusion is simple for the sun, because stars are massive and gravity provides even pressure all over the surface. The pressure squeezes hydrogen gas in the sun's core so immensely that several nuclei combine to form one atom, releasing energy.

But on Earth, we have to supply all of the pressure to keep the reaction going, and it has to be perfectly even. It's hard to do this for any length of time, and it uses a ton of energy. So the reactions usually fizzle out in minutes or seconds.

Still, the latest record of 120 million degrees and 101 seconds is one more step toward sustaining longer and hotter reactions.

Why does this matter? No one denies that humankind needs a clean, unlimited source of energy.

We all recognize that oil and gas are limited resources. But even wind and solar power --- renewable energies --- are fundamentally limited. They are dependent upon a breezy day or a cloudless sky, which we can't always count on.

Nuclear fusion is clean, safe, and environmentally sustainable --- its fuel is a nearly limitless resource since it is simply hydrogen (which can be easily made from water).

With each new milestone, we are creeping closer and closer to a breakthrough for unlimited, clean energy.

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