1. The space in a space capsule is incredibly small. Even the living compartment of the space station is amazingly cramped. People have seen too many sci-fi movies and don't realize this. Something as large as the space station would not be practical to heave to Mars, and even it would not be enough.
2. We have never sent any ship to any planet and brought it back safely to Earth. Our moon is not technically a planet and is in our own earth orbit. We have not even returned a probe from any planet. There are many reasons why this is. It is too difficult and the round trip would double the fuel requirements.
3. There is no liquid water on the surface of Mars. The only water is beneath the surface, far underground, and is frozen. So let us say it takes a year to get there, a group of five stay for three years, and another year returning. All of the water necessary for that group would need to be towed.
4. People get sick. They get violently sick; it is part of life. The amount of equipment, personnel, and electricity (requiring fuel) that a hospital requires to diagnose and treat people would be impractical to haul to Mars. Even well equipped multi-million dollar hospitals in the U.S. often have to send patients to other hospitals that have equipment, treatments, or expertise they lack. People pass diseases. If a person died on this five year journey, the contamination from decomposition would be a threat.
5. People are prone to mental disorders in close quarters with others, under great stress, and with nowhere to get out and see nature. The isolation and cramped quarters would lead to mental illness. Prolonged periods in space have been conducted by solo astronauts and cosmonauts, not groups. The close quarters would increase stress.
6. When people return from a year in zero gravity, as such people would getting there, they lose eyesight and limb coordination. Their muscles atrophy. This requires a long period of physical therapy. But these people would need to be in top form on arrival. That is simply impossible.
7. There is no air on Mars we can breath, and high radiation. There is also nothing to see.
8. The nearest time scale Mars anticipates a trip is the 2030s, and it will likely be much later. I predict that by then the interests of the world will begin to become more internal. People will grow more introspective, and the desire will fade to go where there is nothing at all.
BABA: There is existing at the moment a universal dissatisfaction and an indescribable longing for something that will end this terrible chaos and misery that is startling the world just now. I am going to satisfy this craving and lead the world to real happiness and peace by making mankind more introspective, and see more to the inside of things, than what they have hitherto been accustomed to.Sorry if this was a big buzz-kill. I'm sure that those who want to go to Mars will not believe a word of this, and will go on dreaming. Baba had something to say to them too.
When mind soars in pursuit of the things conceived in space, it pursues emptiness. — Meher Babahttps://sputniknews.com/art_living/201707081055351836-mars-life-deadlier-than-previously-thought/
The above article explains why recent discoveries show we will not be able to grow anything on Mars as previously thought.
Don't believe me about the small size of space capsules? Above is the current craft being tested by NASA for travel to Mars, called Orion.
The Orion Multi-Purpose Crew Vehicle is an American spacecraft intended to carry a crew of four astronauts to destinations at or beyond low Earth orbit. Currently under development by NASA for launch on the Space Launch System, Orion is intended to facilitate human exploration of asteroids and of Mars. (Wikipedia)
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