The problem with hibernation is that is not remove aging.

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/

How to travel in space without spacecraft?

How to travel in space without spacecraft?

Sometimes this question is coming ahead of us when we are investigating cases, where somebody has seen brilliant light in the sky and suddenly that person was in somewhere, where should not be. The travel without spaceship is impossible, but there is a technical solution, which might make possible to travel to space by using only the space suit.

Of course, we could create a very small size craft, which will pull us to space. If the exhaust gas of the rocket motor would not touch the person,  the spacecraft would pull that person to space, while an astronaut is hanging outside it. The aerodynamic structure of the craft would protect that traveler against the heat, which causes by the friction.

But when we are thinking about the systems, what can transport the person to another side of the universe or at least to another planet, would there possibility that the skin of the traveler would be covered by using nanotechnology. In this case, the nanomaterial would be the bag, which is equipped with iron, which makes magnets able to touch it.

This could be the effective rescue system in tomorrow spacecraft

That thing would deny the skint touch with vacuum, and then the artificial tornado would pull the traveler up from the ground, then the plates or saucers what will be equipped with magnets will form the magnet track, what will accelerate the inmate in very high speed. This system would be used in the travels to the places like Titan moon because if the astronaut will hurt, the return of that person must be done even the normal support system would not able to land in that place.

The purpose of those nanomachines has also protected the body from the high power magnet field. Then the magnets would send that inmate to the place, where the body would cover by an ice cube, what denies the contact with the vacuum, and the blood veins will be connected to the systems, what will support the life by changing the nutrient and cleaning the blood gasses from the metabolic waste.

But if the temperature of the body would be low enough, there is not molecular resonance, what denies the getting old process. And the hypothetical astronaut can live forever, which means that the system would melt that person after a very long time.

In the wildest dreams, this system would use extremely high power magnetic field to create the artificial black hole or singularity, and this would make possible to teleport that person to another side of the universe. But if we ever could create so long-term singularity that the spacecraft can fly through them, we could use the extremely high mass objects as the gravity or magnetic sling.

The space suit can be used as spacecraft  even in long space journeys if the astronaut would freeze in very low temperature

In this more conventional version of the singularity travel, we would create the particle, what is equipped with a very powerful magnet field, and the spacecraft would use that thing as the magnet sling. But in this case, the spacecraft must be very light, and maybe the best solution would send the astronaut to trip by using just only the space suit or some other more exotic solution.

If we would think more carefully about this kind of things that kind of things would be very useful in the long term space trip. In those solutions, the astronaut would be freeze to very low temperature, and then they would send to another planet or star.

When the astronaut would be in very cold temperature, what might be near zero Kelvin degrees, that means that the astronaut would not need to move during the journey. And in this case, the giant spacecraft would send to orbit the target star, and when those packages would arrive, they would be taken in the spacecraft.