The artist's vision of the exoplanet "Proxima B". The surface of the closest known exoplanet, "Proxima B" or "Proxima Centauri B", could look like this artist's vision.
If the planet's surface is too hostile there will not form lifeforms. Life as we know it requires liquid water. And of course, life needs the right environment for advancement. But when we are trying to think about what is the right environment for creating advanced civilizations we must realize one thing.
There must be some reason for intelligence. The species must get some benefit from intelligence. And that means that if the conditions on the planet are too stable there is no need for intelligence.
The planet that is favorable for the development of life is not necessarily favorable for the development of intelligence. There must happen something that makes evolution benefit intelligent lifeforms.
Species like humans use intelligence to adapt the environmental changes. Intelligence makes humans more flexible than other species. We can make houses and clothes to protect us against the weather.
The water layer on the planet itself cannot guarantee that life is possible on those planets.
We can also move to places where no other species can live. But the fact is that we must have the motivation to make that thing.
But if the pressure on that planet is too high, the water can boil. Also, a strong gravitational field can cause the water cannot to vaporize. There are planets where massive gravitation pulls water to hot ice.
The temperature of that ice can be extremely hot. But gravitation denies it's boiling. So water layer itself doesn't guarantee that life is possible on those planets.
If we think of things like water worlds or planets that are covered by a water layer those planets can offer the perfect place for underwater species. The water gives good protection against cosmic radiation.
But could those species turn intelligent and fly to space? The thing is that if those underwater creatures use volcanic temperature. They can create metallurgy.
And they can use the "space suits" filled with water. That allows them to breathe on the gills at drylands.
In too favorable conditions a large number of descendants is enough. There must happen something. That makes species turn to favor the high-quality descendants.
Species requires intelligence to find nutrient. And maybe the ice ages are the reason why humans are so intelligent. In those conditions, the ability to solve problems. And making new inventions was important for survivability.
Intelligence is the key element of advanced technology. And advanced technology requires places where individuals can develop it. The key role in that process is the need for those inventions.
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