By Joseph
(Shengxiang Hu)
Does anyone believe that there are aliens in the vast universe? I believe! It is true that biology needs not only light, water, and air, but also the North and South Pole. Earth possesses all of the above, and the Milky Way Galaxy is only a part of the universe, 
which human beings can not explore farther. So it is 80% possibility that aliens exist. Have the aliens arrived at earth yet? This is still a mystery. Scientists have never given up exploring for aliens. There are many examples, although we do not know whether they are true or not.
Some books said that someone saw aliens, but actually they do not have evidence. Some pictures might be processed images; videos might also record natural phenomenon, and many natural phenomenon videos looked much like UFOs. But according to experts on the interpretation of these photos, they are a very common phenomenon!
I do not rule out that aliens have been to the earth. However, I believe that aliens exist. I think there is biology which can survive in the anaerobic environment. I also think aliens have observed us for a long time. When we reach a certain level of civilization, aliens will take the initiative to contact us.
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