Many scientists think that hibernation is useless in long-term space travel. The fact is that normal hibernation or normal anesthesia cannot help people in long-term space travel at all. Hibernation can be a good way to control a person who is psychotic or injured.
But the hibernation itself does not affect things like a lifetime. The major problem with long-term spaceflight is the aging of the people. And hibernation does not affect that thing. But hibernation is the gate to cryogenic space travel. Cryogenic space travel means that the crew will freeze to the temperature of zero kelvin.
Why cryogenics is a promising way to make extreme long-term spaceflight? The reason, why cryogenics is better than so-called normal hibernation or narcosis is the oscillation of the DNA and other molecules' ends. This means the space traveler will not age. The idea is that when the spacecraft comes near its destiny. The system will start to warm those astronauts.
And when they are put in the cryonic chambers, their body can equip with the resuscitation equipment that can involve a system, that can turn the heat on. A ventilator or internal blood oxygenize can help to restore vital signs. That blood oxygenize can recycle blood through the unit that will oxygenize hemoglobin. After that, this oxygenized blood will transfer back to the veins.
The problem with cryonics is how to wake up those astronauts after frozen. If the rise of the temperature is too fast. The expansion of the ice rips those cells into bites. So the rise of temperature must be slow enough and the resuscitation equipment will start the vital signs at the right moment. If that moment is too late there is an oxygen lack in the body. The thing is that aging is the dominating problem in interstellar or extreme long space missions.
By the way...
Phoenix-immortality
In some visions, the astronauts will travel in interstellar flights fully awake. Those astronauts will age normally. After that, their memories will transfer to their next body. Then that system clones the astronauts' bodies. That means "Phoenix immortality". In legends, Phoenix is the bird that creates one egg before it dies. Then that mythic Phoenix will burn in fire. And the next Phoenix will come from the egg.
In some other visions, the astronauts will travel in the form of cell cultures. When the system requires the astronaut it will make that person by using a bioprinter. That thing can be called as Frankenstein model. The idea is that bioprinters and highly advanced life support systems can make it possible to create even humans by using bioprinters.
The thing is that many visions can make it possible to travel between stars. But the problem is that the interstellar spacecraft cannot send data back to Earth. If we can make a spacecraft that travels at the speed of light. It travels to Sirius in 8,7 years. And the message will travel back another 8,7 years.
Time is the biggest problem in long-range spaceflights.
The fact is that our first interplanetary flight to Mars or Venus is at the planning level. Theoretical research is on the way. But the fact is that there are many technical, social, and other problems to win before we can travel even to the closest planets.
The journey to Jupiter will take a very long time. Pioneer 10 spacecraft reached Jupiter in one year. But that was flyby. That spacecraft must not brake when it reached the planet.
The orbiter craft requires more flight time. The reason for that is they need to slow their speed to reach the orbital trajectory.
The Galileo spacecraft reach Jupiter in 3 or almost 2000 days. The entire flight time to Jupiter was far longer. Galileo launched on October 18, 1989, and it arrived at Jupiter on December 8, 1995. Galileo made two gravitational assist flybys to Earth. And one to Venus to get enough energy to travel to Jupiter.
The flight time to Jupiter is calculated from the last flyby when that craft traveled to Jupiter. And still, the travel time to Jupiter is three times longer than Pioneer 10. The reason for that was that Galileo needed the slowdown. And the manned spacecraft would need more time because their mass would be higher.
The problems with that kind of flight are time and social relations. The flight time to Jupiter and back would be about 6-8 years. And the craft should spend little time in the orbiter. So the crew will age very much during that trip. And if we would someday make an interstellar flight or travel outside the solar system that takes even more time.
https://owlcation.com/stem/Galileos-Fight-and-Flight-to-Jupiter
https://www.sciencealert.com/a-common-sci-fi-solution-for-long-distance-space-travel-could-be-pointless-for-humans
https://www.universetoday.com/128259/long-take-get-jupiter/#:~:text=Galileo%20actually%20took%20exactly%20three%20years%20%28about%201100,Jupiter%20and%20save%20many%20years%20of%20travel%20time.
https://en.wikipedia.org/wiki/Cryogenics
Image 1: https://www.sciencealert.com/a-common-sci-fi-solution-for-long-distance-space-travel-could-be-pointless-for-humans
https://writingsaboutmysteries.blogspot.com/
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