Who knows if there are aliens outside the earth

Actually, no one knows. Water can't be there or not.

Let's assume that life and civilization appeared on a planet similar to our Earth, and now let's estimate the probability of their occurrence. (Let's say it's in the Milky Way).

Astronomers say that the Milky Way has 4 x 10 11 stars, and about 50 are single stars. About 10 of the single stars have the size and mass of the Sun. In the case of a star like the Sun, the probability of a planet is difficult to say, and the probability can be estimated at 10 to 100.

Among planets, such as the Earth, it is also difficult to estimate the good environment, estimated at 10 to 100.

With such good conditions, the probability of the appearance of a creature? What is the probability of biological evolution? If you think that an animal like a dolphin has no hands, it is very unlikely that it will evolve.

Scientists estimate that the likelihood of evolving into a spiritual animal is slim to 10 (-6), but optimistic estimates are as low as 100.

In this way, it is optimistically estimated that one in every 20 stars will find life. Pessimistic estimates suggest that there are about 20 planets in the entire Milky Way that have life.

The universe is so big, there is a great possibility of civilization appearing. Moreover, the possibility of aliens visiting Earth should also be very high. But what are they a**?

Fermi thinks:1Spaceflight has difficulties that we don't yet understand.

2.Astronautics is judged to be an unworthwhile activity! 3.

Civilization exists for a short time!!

Regarding the third point, we can think of the history of our human race, and we can also imagine the law of conservation of energy and the principle of entropy increase. Also, civilization is fragile and tends to dig its own grave!! Please see.

There is still no answer to this question, there are absolutely extraterrestrial civilizations! If you think about it, there are human beings in the universe. Then there is more than one kind of living thing, there must be tens of thousands, but the technology of our human beings is not high.

If we want to find aliens, then we can't live in this life.

There must be, and it's very close to us Recently, I heard that the moon is a base for aliens to monitor earthlings, and we will know as soon as humans land on the moon again

Yes, I'm going to Mars, you can call me a Martian.

I think aliens exist:

Aliens in a narrow sense refer to highly intelligent life on stars other than the Earth, and aliens in a broad sense refer to highly intelligent life on other planets, including earthlings who become aliens on other planets when they arrive on other planets.

About Aliens:

1. It is possible for aliens other than the earth or for earthlings to become aliens on other stars. Because the universe is so big, it is impossible for life to exist only on the earth, and there must be life on other planets, but we have not yet discovered it. The earthlings had already landed on the moon, and at that time these astronauts had become aliens on the moon, so there were aliens in the universe.

Second, it is certain that there were humans when they landed on other stars, because at this time they became aliens on this star. And the question of whether there are extraterrestrials in the universe beyond Earth is now impossible to answer.

3. What is certain, however, is that there is no conclusive evidence that aliens have ever visited the Earth. It is not uncommon for some people to refer to natural phenomena that cannot be explained by modern science as extraterrestrial visits (UFOs). And a lot of times what they see is actually artificial aerial vehicles.

There are also some people who say that the ancient civilization of mankind is an alien civilization and attribute everything that cannot be explained now to the masterpiece of aliens, which is an insult to mankind itself! As a matter of fact, man's creative power is very strong, and what we cannot do now does not mean that ancient human beings could not do it. Don't say anything is alien.

4. UFO refers to an unknown flying object and generally refers to all non-man-made flying objects. UFOs must be there, and there are many things that humans can't explain. But whether it is related to extraterrestrials is unknown.

This is an unsolved mystery, go and see CCTV-10 to explore the secret realm of discovery tracking, there will be a lot of gains, the previous unsolved mysteries have been solved.

Yes, though it's not clear what their intelligence is.

There is wood, no one knows!

Such a big universe is only us human beings, do you believe it?

At present, there are many cases of alien discovery on Earth, but there is no conclusive evidence about aliens, and I think that the universe is vast and boundless, and there should be aliens

First of all, our universe is very vast. Even if it's the place we humans are currently detecting. There are also more than 100 supernebulae.

There are about 1,000 galaxies like the Milky Way in one supernebula. There are about 10,000 solar system-like galaxies in one Milky Way. It is possible that there is more than one planet in a solar system that has life.

So. Let's do the math.

100 1000 10000 1 = 1 billion. In just the places where we humans have explored, there are a billion planets like Earth that can be inhabited by life. For a variety of reasons, some planets cannot survive.

If you choose one in a hundred, there are also 10 million planets that can always allow life to survive.

I believe that extraterrestrial life exists, after all, the universe is boundless, and since the earth can have life, why can't other planets produce a high degree of civilization!

It is understood that there are 200 billion "brothers and sisters" of the sun in the Milky Way, and scientists have found 150 stars with planets orbiting them, which are distant relatives of the Earth. Even if one of the 10 stars has planets orbiting, then the earth should have 20 billion brothers and sisters in the galaxy, just like only the earth has advanced intelligent life among the nine planets of the sun, then there should be 100,000-150,000 planets suitable for the development of life, and then intelligent life will be produced to form a technological civilization, and they should have a civilization similar to or more advanced than the earth.

So, the possibility of life in outer space is very high. It's just that we don't have a way to understand each other, and we learn from them and think about the same problem. Life in outer space may be more advanced than our science, it may be even more backward, and whether we can find them is unknown.

That's my opinion.

In mathematical probability, there is. It's just that many realistic things can't be determined by probability, but how can there be no aliens on hundreds of millions of planets in the universe? British physicist Stephen Hawking said that aliens can exist in space, not necessarily on planets.

But now science has not made a determination, in the language of the language, there are believers, and there are non-believers! Hope it helps! Thanks for adopting!

This problem has existed since ancient times, and according to the current understanding, there are many planets outside the universe that are similar to the earth's environment, which means that it is very likely that extraterrestrial life exists, but the astronomical receiving device has not received the signal of alien life so far, so this is still a fantastic unsolved mystery. If there is hope, then life will no longer be lonely. But with aliens, maybe it won't be so smooth.