Yet another reason interstellar travel is a pipe dream for biological life. You know…like humans. We’re not gonna do it. Get over it. It’s unrealistic, impractical and poses too many health risks to humans (biological life forms). Humans evolved in a 1G environment with a nitrogen/oxygen air mixture. In other words, we evolved to live on earth, a planet. We are not evolved for space travel. We can still take short hops from planet to planet, spend a little time in space without much adverse effects. However, prolonged exposure to microgravity does bad things to the human body.

A lot of people have this dream of interstellar travel. And even NASA and scientists, cosmologists, physicists, astronomers, etc., all have these grand dreams of traveling throughout the galaxy jumping from one star system to another.

I think that’s a delusion, and we’re fools to think we’re going to be able to survive for long out there in microgravity. Not to mention radiation. Impact dangers. Oxygen depletion. Food. Water. Nutrients. Etc. All of which we need to take with us to survive.

This is why I don’t think humans will ever travel to another star system. Ever.

Not being negative Nancy, it’s just logic and reason and critical thinking and science. Biology says it’s impractical and dangerous. Too dangerous for the long term because humans would not survive.

Even with artificial gravity. Which I feel will NOT work. Spin up a space station and try it. The inertia only works when one object is in contact with another. The moment that object (a human being) exerts enough force to counter the inertia from the spinning space station, it negates the force. Thereby making the human float in microgravity. You would literally have to build enough inertia in the body (human) to stay standing on the inner surface of the spinning ring of the space station.

The moment you start to walk, you’re exerting force against inertia with every step you take. You lose the inertia from centrifugal force and will eventually float off the ring into the airspace in the core of the ring while it zips past you.

Someone will cite “an object in motion tends to stay in motion.” But I think they are neglecting to factor in walking…and the force applied against the inertia, which I think will negate the inertia and so artificial gravity isn’t going to work. At least not by spinning a ring and hoping to walk along its inner surface.

Anyway. The point here is gravity. We evolved in a 1G environment. Our bodies work best in a 1G environment. It doesn’t work well in microgravity.

Atrophy, loss of bone and muscle mass, vascular issues; the heart has problems pumping blood. Pressures and vacuum, there could be issues with hypoxia, intracranial pressure, blood pressure, vision problems, mental health issues…the list goes on and on.

All of these are just a few problems of prolonged exposure to a microgravity environment, and doesn’t come anywhere near the long term exposure that interstellar travel would require and those effects on the human body.

Traveling to Mars is going to be an issue because the fastest time to get there is about 6 months or so. The longest any astronaut has ever spent in space is just over a year. Mars’ gravity is about 1/3 or about 37% of Earth’s gravity. And that poses a significant problem. Though not microgravity, it’s still nearly 2/3 lower than what humans experience on earth.

We don’t know how the human body will respond to such gravitational conditions long term.

Not to mention solar radiation. Extreme cold. There’s a very thin atmosphere on Mars. It’s just not hospitable for humans.

Interstellar travel is even worse. It took nearly 50 years for Voyager I and II to leave our solar system after launch LOL HAHAHAHAHA!

Granted, propulsion technology is better now, but not by much in comparison.

Humans will likely never reach our nearest neighboring star system, Proxima Centauri. (which BTW has an earth-like planet orbiting in the habitable zone; which means there might be life there; maybe even intelligent life. And it’s about 300 million years older than our solar system and our planet. So yeah.

If life evolved on that planet similarly to earth, and it became intelligent, then it likely realized hundreds of millions of years ago that interstellar travel for biological life forms is a pipe dream.