The reason for our "loneliness" in space may be gravity
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Infinitely continuing search for extraterrestrial intelligent life for some gradually and imperceptibly flows into a real obsession. Scientists can't understand why we still haven't found, despite all our efforts, and theoretical base which clearly alludes to a very different outcome. Recently, new hypotheses that explain our loneliness. For example, according to one of the latter, the case may be . However, the German astrophysicist Michael Hippke of Sonneborghe Observatory has a different opinion on this matter.
According to German researcher, one of the most serious difficulties that can stand in front of extraterrestrial civilizations on their journey of development and exploration of outer space, is gravity, is able to simply close access to the space even technologically advanced aliens.
And how people, you ask? After all, less than the last 100 years mankind has not only found a way to reach beyond the atmosphere of our home planet, but also the beginning of active exploration of other planets of the Solar system. So why advanced extraterrestrials would not be able to do the same?
The Problem, according to Hippke is the planets themselves that these (hypothetical) extraterrestrial civilizations (hypothetically) call home.
According to the most popular among astronomers believed that the most suitable planets are so-called super-earths — rocky exoplanet possessing significantly higher in comparison with our Earth weights, and a more dense atmosphere, which is able to protect located on the surface or under a conditional form of life. Such planets, scientists can have all the necessary resources for life. However, they have one serious drawback.
"the more massive the planet, the significantly more expensive to produce space launch" — commented on Hippke portal Space.com
In their study, Heppke calculated the required thrust level, the required spacecraft in order to break out of the atmosphere the average or even super-earths more massive planet. According to the calculations, the use of conventional rocket fuel in these cases to quickly translate such launches from the category of expensive in the category of impossible.
For Example, to run a classic rocket of the Apollo program (they used to fly to the moon) from the surface of super-earths will need approximately 400,000 tonnes of fuel, according to Hippke in his article , "equivalent to the mass of the great pyramid, and probably is the real limit for missiles, operating on the basis of HRD (chemical rocket engines). Anything more – is too expensive."
Hippke Calculations show that the use of space vehicles on the basis of the HRD with the use of conventional fuel would be possible but too impractical for civilizations living on the surface of the supertall. However, if we are talking about even more massive worlds, then their residents will have to find an alternative powerplant for access to space, some of which may be, for example, a nuclear power plant.
More Than a planet and its mass, the less is the efficiency of chemical fuels. Lack of efficiency = increased consumption. Increased consumption = reduced economic feasibility. In the end, says Hepke, fuel for each run will be required so that it is in a General sense, will reduce the number of possible runs and, as a consequence, the development of the space program.
But since we're talking about hypothetical extraterrestrial civilizations, it is quite possible, it is absolutely about other, not like our technology, allowing them to explore the outer space. However, we have yet another perfectly reasonable explanation for why we still haven't found in space.
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