We are not the only humans in this universe! Or human beings don't only exist on the earth, do you agree?

Man has not found the only conclusive evidence that man and the universe are not the only ones. So for the time being, we can think that human beings and the universe are unique. Of course, as long as we find a counterexample, this assumption can be overturned.

There is no definite evidence for the existence of aliens and parallel universes, and they all stay at the level of "legend". In fact, aliens and parallel universes are the same as ancient monsters. Only our knowledge tells us that aliens and parallel universes are reasonable, monsters are unreasonable, and the ancients are the opposite.

If you want to know the facts, it is very difficult, at least the current level of science and technology can't do it. If you really want to know, you have to devote yourself to scientific research.

I think our galaxy is spherical in distribution, and there is a singularity in the center of the sphere. Now the universe is slowing down and expanding, and it will shrink back to the singularity in the future, and it will cycle again. There are countless singularities like us in the universe, and intelligent life should not be just us in the universe. Due to the limitation of physical conditions, we should not be able to contact with very distant intelligent life. I published an article about the universe in Zhihu. I can read it when I have time.

This is a famous photo. When Voyager 1 was about to fly out of the solar system, 6 billion kilometers away from the Earth, NASA ordered it to look back and took 60 photos, one of which happened to include the Earth, which is the bright spot in the picture. Carl sagan, an astrophysicist and a famous popular science writer, once said a very famous sentence: "At this small point, everyone you love, everyone you know, everyone you have heard of, and everyone who once existed will spend their lives there.

Here are all joys and sufferings, thousands of confident religious, ideological and economic theories, every hunter and explorer, every hero and coward, every creator and destroyer of civilization, every king and farmer, every young couple in love, every hopeful child, every parent, inventor and explorer, every moral teacher, every corrupt politician, every superstar. "