Cosmic Wars How many alien civilizations could there be in the galaxy?

The Sun is only one of about 300 billion stars in the Milky Way. Astronomers believe that the Milky Way galaxy has about 93 stars with planetary systems, or 280 billion stars. Since life on planets depends on the light and heat of stars, the mass of stars is required to be no more than 1 4 times that of the Sun and not less than 1 3 of the Sun, and such solar-type stars account for about 1 4 of the total number, or 75 billion.

Considering that planets can neither be too close nor too far from the star to avoid overheating or cooling, there are about 2 3 stars of this type with a good ecological environment, or 52 billion of them. Since the origin of life must have elements such as carbon, hydrogen, oxygen, nitrogen, and sulfur, which generally only exist in new stars and planetary systems formed by the dust of old stars after the disintegration, it is necessary to look for in the planetary systems of the second generation of stars, which have about 1,100,000,000,000 stars, or 5.2 billion stars. It is estimated that only one of every two second-generation stars in the ecosystem has the required elemental conditions, and only half of the Earth-type planets with a mass of 40 or more than the Earth's mass are about 1.3 billion.

About 1 in 2 Earth-shaped planets can support life, so there are about 650 million planets that can reproduce life. Because nearly 8 planets are too young to give birth to life, the number of planets in the Milky Way needs to be reduced by another 500 million, so that the number of planets inhabited by life in the Milky Way is 600 million. If life on these planets evolves similarly to Earth, there are nearly 70 planets, or 41.6 billion, that are rich in colorful terrestrial life.

Some of these planetary life will also evolve into intelligent beings and form their own civilizations, and it is estimated that the proportion is about 1,400, or about 1 million.

Humans themselves are pets of a super civilization, can you believe it? I believe it!

Not all civilizations have evolved like we do, so don't look at life in the universe with our eyes.

Let's study the earthlings first, which galaxy ...... fromIn the past 200 years, the development of the earth branch does not feel a little ......

Aliens are on their own planet, thinking about what we are doing on the other side of the planet!

A galaxy is a civilization, and the earth should belong to the ,...... of low-level civilizations

All life in the universe is not necessarily the same as the Earth! The environment is different! Life forms are different!

The Buddha said that there are 3,000 worlds, and all the celestial beings in the world, such asas (Islam), are very happy when they hear what the Buddha says

How many extraterrestrial civilizations exist, and when will one of them send a message to Earth? A new study seems to provide the answer.

According to a new ** published April 1 in The Astrophysical Journal, there could be as many as 42,777 extraterrestrial civilizations in our galaxy that could touch Earth in the next 2,000 years.

Scientists use probabilistic simulations to estimate the number of extraterrestrial civilizations that may exist in our galaxy, and they come up with a very specific number: 42,777, with a margin of error of -369 to +267.

This value was calculated by Song Wenjie and He Gao, researchers from the Department of Astronomy at Beijing Normal University in China, who used the Monte Carlo method, also known as statistical simulation, to arrive at their conclusions.

Previously, scientists have tried to count the number of extraterrestrial civilizations that may exist in our galaxy. One of the most notable is astronomer Frank Drake, who proposed the Drake equation in 1961 to estimate the number of intelligent extraterrestrial civilizations.

The problem with the Drake equation and other calculations that estimate the likelihood of extraterrestrial life is that there are too many uncertainties. Therefore, the model is based on reasonable assumptions, which may or may not be.

Using the latest information, Song and Gao modeled star formation in our Milky Way, taking into account metallicity and mass, the probability of terrestrial planets forming in the habitable zone of stars, and the probability of life appearing and eventually becoming advanced enough to communicate with Earth.

On top of that, astronomers also took into account the time scales involved in order to conclude how long humans would need to survive to detect extraterrestrial signals.

Their research yielded two main results: one optimistic and one pessimistic. In an optimistic scenario, the researchers propose that there are 42,777 extraterrestrial civilizations throughout the galaxy that will take an average of 2,000 years to communicate with us.

In a pessimistic scenario, the possibility of the emergence of extraterrestrial civilizations is only. That is, there are about 111 extraterrestrial civilizations, and they may not come into contact with humans for another 400,000 years.

Song and Gao said their research could answer questions about the Fermi paradox. In an informal discussion in 1950, physicist Fermi asked why humanity had not received any signals from extraterrestrial life if there were a large number of advanced extraterrestrial civilizations in the Milky Way.

The reason why we are not receiving the signal may be that the current human life span is not long enough", the study reads, and it has been suggested that the lifespan of civilizations is likely to be self-limiting, with many potentially damaging factors, such as demographic problems, nuclear annihilation, sudden climate change, rogue comets, and ecological changes.

In fact, there are too many galaxies in the universe to count, and if you look up at a random star, it is possible to contain one or more galaxies.

The Milky Way is made up of hundreds of billions of stars, including various stars in the universe, including neutron stars, black holes, and more. How did the universe come into being? The most popular theory is the big ** theory:

The universe was formed after a hot infinitesimal singularity** 13.7 billion years ago, the expansion of the universe is accelerating, the galaxies in the universe are getting farther and farther away, and the galaxies of the Milky Way and the solar system are becoming more and more sparse.

The universe is filled with large gas clouds left behind, and in some places there are thick interstellar gases, mainly hydrogen and helium, and due to the gravitational pull of these huge gas clouds, tens of millions of rough stars have been formed. Most of the first stars were supermassive stars with high temperatures and burning so fast that they created huge black holes behind them. Geocentrism was first proposed by the ancient Greek scholar Eudox, who believed that the earth is the center of the universe and that other celestial bodies, including the sun, move around the earth.

Ptolemy further developed and refined the theory, establishing the world's first complete model of a planetary system. The Earth is at the center of the universe, and the other star that people see at night is a celestial sphere that circles the universe and is dotted with stars. Until the American astronomer Edwin.

Hubble discovered that the Andromeda Nebula was far more spaced than the diameter of the Milky Way, which was measured by the Andromeda variable, which means that it is not part of the Milky Way, which means that there is not only one galaxy in the universe...

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There are many galaxies in the universe, and they are too many to count, the most famous of which is probably the cosmic system, the solar system and the Milky Way.

There are more than 3,000 galaxies in the universe, and the space of these galaxies is very large.

The universe is a very large space, so there are more than 3,000 galaxies in the universe in addition to the Milky Way and the solar system.