One day, whether from curiosity, or out of necessity, or for both reasons at once, but the human species would have to leave the planet Earth and begin the journey to the stars. Before making this historic journey we will need to consider many factors.
Example, how quickly we can get to that planet, which we want to colonize, or how many people need to put on a spaceship that this possibility could really succeed?
Although previous studies on this subject, one of which was, for example, in 2002, argued that to start a new human race will need a total of 150 people, a new study from John Moore University of Florida states that the number of people required for settlement another planet would have to be at least 10,000, and best of all – 40 000.
So why do so many people? The first thing you should pay our attention to is the fact that even the closest star system to us, Proxima Centauri, is located at a distance of more than four light-years from Earth. The current level of technology development will require us thousands of years to get there only. It also means that we need to build a spaceship carrying will be born and die a few generations who will not even see that planet that humanity wants to colonize, not to mention the planet, where they come from. 150 people may actually be able to cope with this task, but an excessively low genetic diversity can boost the risk of various diseases and genetic abnormalities that endanger the entire mission to colonize. In his study, Moore points out that the higher the number of people, at least 10,000 will be able to increase the overall level of diversity in the gene pool of viable tools.
The second reason why the need for space colonization of many people is the risk of various disasters. Definitely will be illness, man-made disasters, aliens can come for new slaves, in general, we must consider each of these risks, because each of them can significantly reduce the population of space colonists. The more people go to the colonization, the less will be disastrous consequences of their loss.
Moore arrived at these figures? As part of his research, he used a computer model invented by William Gardner-O’Kirni archaeologist from Portland (Oregon, USA). This algorithm allows the computer model to produce a selection of different events that can happen during space travel. Defining the initial population size and paint it, for example, span 300 years (30 generations), the algorithm runs the each number (number) 10 times and displays the average of the residual number of people in a given simulation model developments.
It should be noted that first of all, this model allows Calculated consider the consequences of unexpected events that may occur in space. So, the results show that the presence of initial 40,000 colonists, genetic diversity will be 100 percent. However, even when there are only 10,000 people, it is the genetic diversity remains quite acceptable level. The model shows that in the case of events that may affect the size of the population, both of these numbers you can save enough colonists to maintain genetic diversity. If the initial number of colonists would be less than 10,000, it will significantly reduce people’s chances of survival and development on another planet.
Of course, all these elections and flour calculations instantly evaporate as soon as scientists create the first warp drive, work on which is rumored to be already underway.