Which type of planet is most likely to produce intelligent life by the standards of the group of stars?

According to our human knowledge of the universe at this stage, the only planet that can confirm the existence of life is the Earth, so as such, the conditions of other planets in the universe that may exist life is assumed, then it must be Earth-like planets, i.e., planets similar to the key to the universe where the Earth is located, because at the very least, under the environment of the Earth, there is life on our Earth exists, so regardless of the existence of other forms of life in the universe How, we now only know of our Earth, since our Earth this kind of cosmic environment can produce life, then similar planets should also be possible to produce life, as a reasoning is also common sense!

After all, the level of human science and technology is still very limited, the cognition of the universe is only a very small range, but for the exploration of aliens in the universe, has long been a hotspot for many people's attention, after all, by a variety of unidentified flying objects of the news flooded the major news UFO Chinese network of the era is also existed, of course, part of the real is due to the some people in order to get everyone's eyeballs and fake! The shooting, but there is a part of it is really so far can not be explained by scientific means, so the exploration of outer space is a did not stop.

For other life forms in the universe, the exploration of a continued, theoretically speaking, the universe is so huge, although now there is speculation on the size of the universe edge, but also recognized that the universe is still expanding, so it can also be said that the universe is really infinite, so

The universe of the planets of the celestial bodies are also more than countless, in addition to the age of the Earth is now calculated as the age of most of the stars in the universe, but also the age of the universe, the age of the universe, the age of the universe, and the age of the universe, the age of the universe. Relative to most of the stars in the universe is very young, so on this basis, since the Earth can evolve life, the other planets than the Earth older than so many planets, there is a great possibility that life can be evolved na, just from our current cognitive range, or not found aliens only it, of course, this holiday is a huge possibility.