Therefore, extraterrestrial civilizations capable of receiving human radio waves must be within 100 light years. Of course, we can not use human science and technology to measure alien science and technology, if the alien civilization is much more developed than human beings, has long not used the backward communication technology of radio waves, but adopted more advanced radio technology such as quantum entanglement suitable for rapid transmission in space, then the possibility of receiving human radio waves is even less.
So the real problem for humans is not how long it takes them to receive signalsHumans do not yet have the ability to transmit radio signals that can be received by each other. It is a question whether the radio signals currently sent by humans can be transmitted between universes, after all, if they can be transmitted to each other, if the signal received by the other party is very weak, then the transmitted information will not be recognized by the other party, which is equivalent to spending a billion years of useless work.
The probability of being received by aliens is also very low, and there is basically no need to worry. The radio waves that humans have sent into space have only a short time, so far those earliest radios have only traveled a hundred light years, and there is no known text in this rangeMing, even if there is, the high level of civilization, do not look at our low level of civilization, and the level of civilization similar to us, can not come to the Earth, so there is no need to worry about it.
The radio waves are picked up by the satellite, which strengthens the signal, and then sends it back to the earth. You can imagine that the signal sent by a satellite can cover one-third of the surface of the earth, that is, this third of the area can receive the radio waves. Secondly, there are usually three communication satellites in the sky so that the whole world can receive radio waves. It is not that radio waves can travel along the curvature of the EarthElectromagnetic waves emitted by a binary star system. Located in the galaxy Cassiopeia, the binary star system is constantly orbiting each other, emitting radio waves, and has a very small but massive object.
Although there are many electromagnetic wave signals in the universe, but they are different from the electromagnetic wave signals generated by humans on Earth, they are emitted by celestial bodies. Those celestial bodies that can emit electromagnetic waves are usually stars, pulsars, neutron stars, etc., for cosmic people wireless charge to detect signals in different bands, human beings can only develop different wavesSegment of the astronomical telescope to achieve this purpose. "The Law of the Black Forest" in the science fiction novel "The Three-Body Problem" holds that the universe is a dark forest, and each civilization is a hunter with a gun, whose purpose is to destroy other civilizations. If you respond to other people's signals, it is equivalent to exposing your position in the black forest, and it is you who is destroyed.
The signal comes from a distance of about 10 billion light-years from Earth. It seems to record some kind of information, but because of a long time to spread, the contents of the inside has been indistinguishableMHM. At the same time, not only did NASA satellites detect the signal, but within a few months, the astronomical bureaus of Australia, the United Kingdom, Canada and other countries; All picked up the signal separately.
The pictures taken by the probe on the moon are transmitted back to Earth through the radio signals sent by the probe. Instructions from controllers on Earth are also transmitted to the probe by radio. The Chang 'e lunar probe launched by China has communicated with the Earth through radio. The Mars probes launched by the United States and others also use radio to communicate with the Earth.
Highly intelligent creature. According to the query "Ultraman" series of TV series information shows that the universe refers to the imaginary, living outside the Earth similar to the human on Earth or more advanced high intelligent creatures, is the series of aliens, the main types are Zarab star people, Gatz star people, Naker star people, Yabo people, Tynebela star people.
Also known as aliens, extraterrestrial beings, cosmic beings, etc., generally refers to the highly intelligent life forms that survive on planets other than the Earth, and currently stay in the stage of human imagination.
Space people are aliensAnother name for it. Also known as aliens, alien creatures, cosmic creatures, etc.
Its meaning is analyzed as follows: cosmic man, also known as aliens, extraterrestrial beings, cosmic beings, etc., generally refers to the highly intelligent life forms that survive on planets other than the Earth, and currently stay in the stage of human imagination. It means life from beyond Earth. This is because there is no evidence of extraterrestrial life so far, so it is impossible to determine their specific image and characteristics.