Can Venus host lifeforms?

"An artist’s impression of the proposed VERVE mission to Venus the answer whether tiny bacterial lifeforms really do exist in the planet’s clouds. Credit: Danielle Futselaar" (ScitechDaily, Unexplained Gases on Venus: Could They Be the Sign of Alien Life?)

"Could microbial life be drifting in the clouds of Venus? With unexplained signs of phosphine and ammonia scientists are developing a bold new space mission to find out." ScitechDaily, Unexplained Gases on Venus: Could They Be the Sign of Alien Life?)

Phosphine in Venus' atmosphere still remains. Researchers found phosphine and ammonia in that planet’s atmosphere. That causes the possibility that there can be lifeforms on Venus’ clouds. That planet’s atmosphere is far different from Earth's. It’s mainly carbon dioxide and carbon monoxide. 

That means that the atmosphere is very flat. It turns denser differently from Earth. The density rises lower and faster than Earth's atmosphere. If there are some kind of lifeforms, that means there can be some kind of diatoms or other algae or bacteria that can hover. Using their oxygen bubbles. Carbon dioxide is heavier than nitrogen and oxygen. So, if we fill a bag using air, that bag rises to Venus’s atmosphere. 

In some SciFi novels, astronauts rise to their Venus platforms by filling the bags using air, and that bag raises them to the Venus highlands. That causes an idea that in some planet’s atmosphere could hover medusa-type lifeforms that can create oxygen in their cells. Then those “medusas” can hover in that planet’s atmosphere. Originally, astronomer Carl Sagan introduced the idea of “living balls” that could hide in Jupiter or Saturn’s atmospheres. 

So the high pressure of the Venus surface denies water boiling. And one of the models of lifeforms that can survive in extreme conditions is found near hydrothermal vents deep under the ocean surface. 

Supercritical water that doesn’t boil at extremely high temperatures keeps worms, bacteria, and shrimp alive near hydrothermal vents. Hydrothermal vents, called “black smokers,” maintain ecosystems at the depths of the oceans. 

"Black smoker in the Atlantic Ocean" (Wikipedia, Hydrothermal vent)

The reality is that there are always people who say that lifeforms on planets like Venus are impossible because of their temperature and pressure. Those arguments cause discussions because high pressure increases the water's boiling point. The high pressure causes a situation where there could be lifeforms near black smokers, or officially, hydrothermal vents. Water pressure near those hydrothermal vents that are over 3000 meters below the surface is enormous. That pressure forms supercritical water near those hydrothermal vents.

There are bacteria and some worms near those extremely hot points. Those bacteria, worms, and shrimps can stay alive because of the supercritical water. Because water doesn’t form bubbles, those organisms that require enzyme and protein synthesis in that environment can stay alive. If those same organisms rise to normal air pressure and to that temperature, they will die immediately. 

Because of the boiling water, maybe those things can give hints about the lifeforms that can survive on extreme planets. And then we must consider that those lifeforms are fully adapted to their environment, which can be deadly to us. We and no lifeform that lives on drylands can survive near hydrothermal vents. But those lifeforms cannot survive on Earth either. 

https://scitechdaily.com/unexplained-gases-on-venus-could-they-be-the-sign-of-alien-life/

https://en.wikipedia.org/wiki/Hydrothermal_vent

The life on Pluto

The life on Pluto

Pluto is an icy and small dwarf planet, which might have primitive lifeforms. Those lifeforms would live conditions, where is no sunshine, and the temperature is near zero kelvin degrees, which means that the lifeform must be far away from the lifeforms of Earth. But are those suspected lifeforms so different than we think or want to think? Those lifeforms, what we might meet in the absolute cold and dark worlds might use volcanic temperature for creating energy for their metabolism.

And an idea for those lifeforms has been given the bacteria and worms, what are living near the black smokers on the bottom of the Ocean. In those conditions, the lifeforms don't have sunlight for the photosynthesis, and the thing, what gives energy for their chemical reactions comes from the volcanic Geysir at the deep underwater, where is either free oxygen on the water.

The organisms that are found from those "black smokers" are an example for cases, where lifeform doesn't need free oxygen for living. Bacteria, what lives deep undersea are different than other organisms because the oxygen is poison for those organisms, what synthesizing the oxygen from the chemical combinations of sulfur or other molecules, what involve oxygen. There is also higher lifeforms like worms near those black smokers, and that thing has brought a new type of theories of the life in Universe in the mid of cosmologists.

That means that the primitive lifeforms can exist even the asteroids like Ceres, and those archeon bacteria can live in the ice of those asteroids, and the metabolism of those organisms is very slow, what means that they might be hard to detect. That kind of things might not seem important, but if there are some lifeforms on the Universe, the bacteria could be more dangerous than intelligent lifeforms. If we would face intelligent lifeform, we could at least try to discuss with that organism, but the bacteria what would come from the space inside some ice bite would be an organism, what only eats.

And we cannot communicate with those bacteria, what can infect people or vegetables, and there are theories that some of those bacteria would be like the silicon alga, and they could make the core, what protects them against cosmic radiation. So that means that those bacteria could have sleep form, what could live almost forever. The risk is that those hypothetical bacteria might seem a little bit like anthrax bacteria, which can create the germ, which can be dangerous after a very long time.

That ability to cut their metabolism makes the natural bacteria like anthrax very dangerous because those bacteria can wake up after a long time, and start the epidemic. It doesn't make impossible that some bacteria could come from somewhere at Universe during history because we don't at least officially have DNA molecules from another planet.

The thing is that the spectrometers can see amino acid, or actually, they see the elements, what can form the amino acids. And if we want to make sure, that there is DNA on some planet, we must send a probe to that world, and then search the cells, what can be under kilometers bold ice below the surface.