March 1, 2012 17:39
The fact that we exist in a space known diameter of about 240 light-years, is widely known in private.
Mankind is a very modest place, not only in the universe, but also in their home galaxy, the Milky Way. It — place — we have astronomer Adam Grossman (Adam Grossman) in her blog — a small yellow dot. Its diameter is only 240 light years away — really pipsqueak compared to the whole of the galactic spiral, the diameter of which more than 100,000 light-years.
The chances that we are known outside the "Bubble humanity" negligible
Radio was invented in 1895. Since then, artificial electromagnetic signals and fly into space — in all its facets at light speed. With the same speed and scope expanded, filled these signals. Takes the field, where they — signals — can anyone hear. Or at least understand that capture something artificial. Unless, of course, there — in the worlds inside the sphere — there is an inventive sort of radio. Not to mention the radio telescope.
Since the "bubble of humanity" inflated until a little more than 200 light, in worlds that are located on, hardly aware of our rational existence.
"The bubble of humanity", shown in the background of the Milky Way, illustrates how little space in which we somehow currently stated.
Our "application" still no one answered. At least, scientists still have not caught anything encouraging — not alien radio transmissions, or at least some artificial signals. Maybe suitable aliens in our "bubble" is not? Asking yourself this question, Adam Grossman said that he felt very lonely.
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It's too late to hide
According to the renowned British astrophysicist Stephen Hawking, humanity would be better not to advertise its existence. From sin.
— If aliens ever appear here, it can be compared to the arrival of Christopher Columbus in the Americas. But then the Indians somehow not very well developed, — he explains his position. And he adds:
— The desire to rob us — this is one of the reasons that it is not necessary to go to the contact with extraterrestrial races. I think they can live in a huge ship, as exhausted all natural resources of the planet. These aliens are at a very high level of development and begin to migrate in order to capture any suitable planet.
Seth Shostak, a program manager search for signals from extraterrestrial civilizations, thinks it's too late to hide. For the "bubble of humanity" is actually not so small. Radio waves from Earth, extending from the beginning of the era of broadcasting, "washed" more than 6,000 star systems. And every day, the signals reach of human civilization, at least, one of the new system.
It is unlikely that the aliens — even the most advanced — listen to terrestrial radio or watch our TV. With distance "broadcasting" highly distorted. But they can recognize in it an artificial source and pinpoint its location. Scientists estimate that the technique, which overtook the human one hundred or two hundred years, is capable of that. In other words, we have given its location and will continue to give out, even "umolknuv."
Shostak's opinion is shared by the main researcher of the Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Doctor of Physics and Mathematics, Alexander Zaitsev.
— I do not think that Earthlings need to hide from anyone, — he said. — If we assume that there is a strong aggressive civilization, is well ahead of us in development, it can not hide from it. And if "they" technique developed so that they can attack Earth, so they have long been detected radio waves — for example, our satellite TV — and all of us know.
On the other hand, if somewhere there is a civilization, the level of development comparable to us, forging a radio contact with it, we are not at risk. Neither we, nor any of their equipment is unable to fly from one star to another in a relatively short time.
Maybe they have already responded?
August 15, 1977 the impossible happened. Dr. Jerry Ayman working radio telescope "Big Ear" at Ohio State University on the project SETI, registered the famous Wow-signal. Or, to put it in Russian, "Hoo-signal."
Many people still believe that the signal was sent to the alien ship, as came from the area of the constellation Sagittarius, but with an empty plot horizon. But other interpretations and no. At least those that would explain all the features of the transfer.
The signal frequency is 1.42 GHz — the frequency of hydrogen — the one on which, in fact, scientists have been waiting and waiting for extraterrestrial vestochek. Duration — 72 seconds. Just enough and had seen constant amplitude extraterrestrial signal of artificial origin. After radio antenna "Big Ear" fixed — uses the rotation of the Earth to scan the sky. Therefore, a particular source, you can listen for 72 seconds. Of these, half the time the signal intensity should gradually increase — while the telescope is not exactly target the transmitter. In the remaining 36 seconds — gradually decrease. That was fixed.