Earth 2.0 has been caused discussion about the possibility to find another civilization
The Earth 2.0 or officially Kepler-452b is locating extreme log distance from Earth(1).
A new Earth-type planet has been found near the star, which is similar to our own Sun. The journey to that planet would take 1400 years, even if the spacecraft will reach the speed of the light. The planet has been found in the year 2008, but the confirmation of the existence of that planet has been taken time, but in 2015 the confirmation has been got, and Earth 2.0 has turned true.
The mass of that planet is 1,9 times Earth and the temperature is excellent if we are thinking about liquid water, but the journey to that planet will take so long, that we cannot ever go in there by using regular rockets and technology. The thing is that this kind of planets are the most interesting if we are looking for the lifeforms, which are similar to us, and the problem with that kind of things is that the communication with those hypothetical civilizations requires extreme high power communication tools, and the interstellar communication is more complicated than we ever imagined.
The stars are sending the radio transmissions, but also the plasma is causing problems when the radio signal must penetrate in the distant solar systems. The normal frequency what the radio telescopes are observing is the alpha-emission line of the hydrogen or oxygen, and the problem is that most atoms in the Universe are sending radio signals by using that frequency. The water maser emission means that the telescope is observing the spectral fingerprints of hydrogen and oxygen, which tells that there is a possibility that there is water on some planet.
Receiving a signal from other solar systems doesn't mean that the message can be open and understood by humans.
But if we want to communicate with aliens, we should use synthetic radio frequencies, or the message, what we send would be lost in the white noise, what would cover the signal. And if we would want to receive messages, what are coming from the humanoid civilization, we must use very tight bandwidth. That means that if we want to hear the synthetic signal, we must use precise right bandwidth, and there are billions of bandwidths.
And this is the case, if we want to hear those signals. But if we want to understand those signals, we must get the code-key to open them. This means that we should find out the numeric system, what those aliens use, and the problem is that if they are using the quantum computer, the breaking that code is impossible or it would take an extremely long time.
(1) https://en.wikipedia.org/wiki/Kepler-452b
(2) https://en.wikipedia.org/wiki/Emission_spectrum
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