On what planet should we build the first non-Earth city?

I know. It’s sad. Depressing really. Humans will never build a city off our planet Earth.

I say this because of distances. Even if we were to find a planetary candidate, it would take hundreds or thousands or more years to go one way to visit it just to see if the candidate is really like we need, what to speak of building a city.

Distances in space are unimaginably big. Let’s say the nearest star is 4 light years away. There is no guarantee there is life over there, but to travel that 4 light years will not take 4 years, or 40 years. At the fastest speed ever achieved it would take at least 150 years each way.

Suppose we wanted to take a closer look at the Trappist-1 system, 40 light years away. It is the next best candidate for life. That would take a mere 1,500 to 2,000 years to go one way just to see if anything really was habitable, what to speak of building a city.

Sadly, this is indeed science fiction. We want it to happen, so badly, but it never will happen. At most we might leave some foot prints on Mars and send some robotic systems to the moons of Jupiter and Saturn, but that’s it. Long before our sun blows up, life on Earth will be extinguished.

How many earth years would it take to travel to the sun?

The New Horizons space craft set a record at 36,000 miles per hour, the fastest spaceship relative to Earth ever achieved. The sun is 94 million miles away, so if you divide 94 million by 36,000 mph you come up with 2666.67 hours, or 111.111 days. That’s about 3 months and 21 days, round out to 4 months to be safe.

However, you can’t just launch a space ship from Earth directly at the sun and expect to go 36,000 mph. New Horizon’s speed was achieved through slinging around planets, what we call “gravity assist.” Your sun bound space craft would begin slowly and take a very long time to reach the sun.

If it took the Apollo astronauts 3 days to go 250,000 miles to the moon. At that speed it would take just over 3 years to reach the sun.

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Why do aliens always have to look and have similar biology to us?

Exactly! To date, no life has been found on any other planet or meteor. We would really like to find life elsewhere, and the most likely candidates within reach would be the moons of Jupiter and Saturn.

Beyond that you have to go interstellar. Since it would take hundreds or even thousands of years to reach even the nearest stars at the fastest speed we’ve ever achieved in space, interstellar travel is unlikely now or in the future.

Put away Star Trek and Star Wars. Aliens are not visiting us and we are not going to visit them, whatever they may look like.

Have the space missions carried out to date ended up as well as possible, and, for that reason, there haven’t fortunately been any fatalities in space?

Would it be possible to put a person on the moon for a prolonged period of time?

We are too heavily influenced by science fiction writers, movies and XBox to see it for what it is.

Space. The final frontier.

One day in our futures humans will travel to other planets, terraform them and colonize them. We will spread out and our species will survive, even if our own sun blows up. We have to start somewhere. We’ve been to the moon once. Let’s go again. Let’s live on the moon.

That would be very difficult. We would need a way to supply our moon resident with food, water and food. Perhaps it could be as we do now with the International Space station (ISS), i.e. fly up supplies once in awhile.

The problem is that the ISS is in low Earth orbit at 249 miles above mean sea level. The moon, on the other hand is between 225,623 miles at it’s closest, and 248,855 miles at it’s farthest, and is moving away from Earth at a rate of 1.5 inches per year. The moon is more than 906 times further than the ISS.

Taken distances into consideration, I would say it is not practical to have a living human being on the Moon for an extended period of time unless he could somehow grow his own food, and get oxygen and water locally.

We are too heavily influenced by science fiction writers, movies and XBox to see it for what it is. Hopeless.

The answer to your question, sadly, is no.

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Do you think people can really live on Mars?

No, of course not. Hollywood wants us to think so, but sadly, or gladly, this is not and never will be possible.

Mars is a poisonous planet with no liquid water. It is hundreds of degrees below zero at night. You cannot breath the air. You cannot grow food. You cannot make goods there. Everything would have to be imported from Earth at great expense just so a few nuts can go and live.

It’s not happening.