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A lack of gravity could prevent interstellar travelers from reproducing, which is vital to successfully making it to their destination 4 light-years away

Traveling to another star introduces a list of potential problems. One major issue is that the closest star is 4 light-years away, where one light-year is equal to 6 trillion miles. Such a journey could take decades to centuries to complete, meaning the humans aboard would have to procreate, but experts say space sex is just another bullet point on the list of possible hindrances associated with the voyage to the stars.

The problem with space sex is the lack of gravity, according to Athena Andreadis, biologist at the University of Massachusetts Medical School.

"Sex is very difficult in zero gravity, apparently, because you have no traction and you keep bumping against the walls," said Andreadis. "Think about it: You have no friction, you have no resistance."

After sex, there's the birthing process to think about. According to Andreadis, giving birth in zero gravity would be "hell" because gravity and the weight of the baby help the process along.

Microgravity has been known to have negative effects on the human body over time, such as impaired vision, atrophying muscles, reduced blood volume and diminished bone mineral. If microgravity can have such effects on the human body, it could likely harm a fetus or cause birth defects.

Dan Buckland, an MIT researcher who spoke on the topic of space sex and traveling to the stars at the 100-Year Starship Symposium, said that it is currently unknown what gravity has to do with successful reproduction and birth in space, but large starships with the ability to simulate gravity onboard that is also self-sustainable for such a long journey would be required.

While we are far from even that sort of technological development, there is yet another challenge even further ahead in the future if humans were to travel to a star: finding a habitable planet to settle.

Experts say other habitable planets will unlikely mimic Earth, hence, the human settlers would need to live in a dome with an Earth-like biosphere or terraforming the planet as a whole, which is terribly difficult. Terraforming is the process of modifying a planet's atmosphere, temperature, ecology or surface topography in order to make it more similar to Earth.

"Not only are we bad at terraforming, but we don't have the life span or the attention span to carry it through," said Andreadis. "Terraforming is a failure of the imagination. It's like people who take those expensive trips to Paris and eat at McDonald's."

Andreadis even mentioned genetically engineering humans to make it so they can journey to a star and live on another planet without complications, but this raises ethical issues of creating an entirely different second species of human.

Source: Space.com



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How to make the trip
By Senju on 10/5/2011 12:16:21 AM , Rating: 2
The best solution is as follows;
1.) Upload your mind In digital format to the digital mind controller located on the spaceship.

2.) After the spaceship gets near the destination which could take several million years, 20 years prior to arrival, the ship central computer will dispatch the robots to create a new bio-human body (made from samples of your DNS) which will grow for 20 years.

3.) Once the body is developed,your mind is downloaded into the new body. Your new body is specifically designed for the new home planet environment.

From human perspective, it would be like time never passed.
Also, you would have a body that would fit with the new environment.




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