What is the probability of life in the Milky Way

This is the question that asks ...

100% Ah, the Earth is in the Milky Way ...

If the earth is not included, then the conditions are insufficient and the probability cannot be estimated.

Modern astronomy admits that there are about 300 billion stars in the Milky Way, and at least 18 billion planetary systems, and if only 1% of these planetary systems are likely to have living organisms, then the number is still huge, hundreds of millions. And if 1% of those planetary systems had life, we would still have 1.8 million. Let's take it a step further assuming that for every 100 living planets, only shellfish are inhabited by creatures with the same level of intelligence as humans, then there are still tens of thousands of planets in our galaxy that may have advanced life.

This is just our galaxy, how many huge galaxies like the Milky Way exist in the middle of the universe? I'm afraid it's a frightening astronomical amount.

200 billion stars don't have to believe it.

There are more than 100 billion galaxies like the Sun in the Milky Way, so the possibility of life is still very high.

There are as many as 150 billion stars in the Milky Way, and there are even more planets, according to this number, there are at least 1 billion planets similar to the earth, so 1% of the 1 billion planets have life, and there are 10 million life planets, but scientists say that there are many terrestrial planets, but it is not easy to really realize the survival of life, because biological evolution takes a long time, and this site understands.

Is there any other life in the universe This is a topic that people have been studying, and it is also a topic that many people are studying. But strictly speaking, there should be many planets in the universe that are similar to the earth, after all, the universe is too big, and the earth is just a small part of it. However, scientists have already managed to discover hundreds of terrestrial planets.

You must know that there are as many as 150 billion or so stars in the Milky Way, and there are even more planets. Some of them are certainly similar to the Earth, and teams of scientists from various countries are constantly researching them. And hundreds of planets that are very similar to the Earth have been successfully discovered.

How much life exists in the Milky Way?

The Milky Way is more than 100,000 light-years in diameter, and if there are 100 billion planets in the Milky Way, and at least about 1 billion planets similar to Earth, if 1% of these 1 billion planets have life, then there may be 10 million planets of life, and even if it decreases, there will be at least 100,000.

However, some scientists believe that although there are many planets with similar conditions to the earth, there are still not many that can actually evolve into life. It takes a long time for the creatures on the planet to evolve, and the stability of the planet is the key to the development of advanced civilizations. It could be just a small change, and all life on the planet would be ruined.

Therefore, the earth is relatively difficult, and the birth and development of human beings are also difficult to replicate. The existence of extraterrestrial life in the universe has also been continuously studied. It is believed that there will be more progress in science in the near future.

In general, there must be other life in the galaxy, but it is a pity to find traces of other life, of course, it doesn't matter. After all, humanity still has a long way to go.

No matter how conservative people are, there must be other advanced life in the universe, and the galaxy is not just humans, which is indeed quite surprising and interesting, and the mysteries of the universe are always endless.

Let's start with the conclusion: more than 300 million! Half of the stars that resemble the Sun have planets similar to the Earth.

In the galaxy in which we live (the Milky Way), there may be more than 300 million planets with similar conditions to Earth. In the new study, about half of the "sun-like stars" in the Milky Way have rocky planets in the Habitapur region. The Habitapur zone is an area in a planetary system composed of stars and planets where liquid water can exist.

Natalie Barbaria, an astronomer at the University of California, Santa Cruz, who conducted the study, said: "This is the scientific outcome that we all look forward to. ”。

The results of the research were accepted for publication in the astromical journal.

This time, one of the important variables in Derek's equation is given. In 1961, my father, the astronomer Frank Derrick, devised this equation to calculate the number of civilizations in the Milky Way, and several of the seven variables that make up this equation have been identified.

However, regarding "the proportion of planets similar to Earth in stars similar to the Sun", Seth Hustark, an astronomer at the Institute for the Exploration of Extraterrestrial Knowledge of Life (SETI), said: "Whether it is 1 in 1,000 or 1 in 1 million, really no one knows." ”。

Astronomers are using data from NASA's Kepler Telescope to look for Earth-like stars. Kepler has been active in the search for planets outside the solar system for 9 years. About 2,800 extrasolar planets were discovered before the end of the mission in 2018, most of which were similar but not similar to the planets in the solar system.

This time, the research team used the Gaia Space Telescope of the European Space Agency (ESA) to calculate how common a planet like Earth is. With Kepler's observations, and Gaia's observations, which monitors the entire galaxy, the team finally figured out how many planets in the Milky Way are similar to Earth.

In the Drake equation, seven variables are used to estimate the number of civilizations in the Milky Way, taking into account factors such as the proportion of stars similar to the sun with a planetary system, and the number of planets that can inhabit life in each planetary system, and thus consider the probability of "life evolution on planets with perfect conditions" and the probability of "developing technology that can detect life from the Earth". In this equation, it is assumed that tech-savvy extraterrestrial life forms evolve on planets orbiting stars similar to the Sun.

Jason Wright, an astronomer at Pennsylvania State University in the United States who is studying planets habitable for life, said: "When astronomers talk about discovering such planets, they are actually talking about Derek's equation. ”。In addition, he did not participate in the study.

At the center of the Milky Way is a huge black hole, and only a black hole has such a gravitational pull that allows galaxies to revolve around it.

The latest research shows that the Milky Way has four well-defined and fairly symmetrical spiral arms, which are 4,500 light-years apart. The number of stars in the Milky Way is between 100 billion and 400 billion.

The Milky Way as a whole has a poor rotation. The rotation speed at the Sun is about 220 kilometers per second, and the Sun orbits around the galactic center for about 100 million years. The visual absolute magnitude of the Milky Way is equal, and the total mass of the Milky Way is about a trillion times the mass of the Sun.

The age of the Milky Way is about 10 billion years old, and the scientific community believes that the universe occurred about 13.8 billion years ago.

The Milky Way has two companion galaxies: the Large Magellanic Galaxy and the Small Magellanic Galaxy. They are all members of the local group of galaxies and are part of the Virgo Supercluster; It is part of the Laniakea Supercluster.

Galactic Mass:

The estimated mass of the Milky Way varies, depending on the methods and data used. The lowest estimate ranges that the mass of the Milky Way is the mass of the Sun (m), which is slightly less than the mass of the Andromeda Galaxy. In 2009, a star at the outer edge of the Milky Way was found to have a velocity of 254 km s using an array of ultra-long baselines.

Because the orbital velocity depends on the total mass within the radius of the orbit, it is speculated that the Milky Way has a much larger mass, about the same as the Andromeda Galaxy, at a distance of 160,000ly from the center, with a mass of 7 1011m.

In 2010, the radial velocity of the halo was measured and the mass within 8,000 parsecs was found to be 7 1011m. According to a study published in 2014, the total mass of the Milky Way is estimated to be about half the mass of the Andromeda Galaxy. Spring.

Absolutely. The universe is very vast, and the universe is very mysterious, and I believe that there must be life on other planets besides the earth.

It certainly won't exist, because there is no evidence at all, and scientists have not said that a living planet would exist.

There should be living planets, after all, the Milky Way is so big, I believe that there will definitely be other living planets in the Milky Way.

Is there or how many celestial bodies like Earth are there in the universe. The organic molecules on Earth do not fly from outside the sky, but they are possessed by themselves, and substances such as water and oxygen, which are necessary for the existence of life, are also abundant in the embryo of the Earth. What is important, then, is the external conditions that cause the evolution of these organic matter, that is, the light and heat conditions from the sun, which are the external conditions that enable the evolution of the earth's organic matter into living matter.

In other words, because the earth has the two conditions of organic matter and solar light and heat, it also has the necessary conditions for the existence of life. In this way, we just need to explore whether there are planets and star systems in the universe like the Earth-Sun. According to research, there are about 1% of stars of the same type as the Sun in the Milky Way, and at least 10% of them have planets, that is, 100 million stars like the Sun have planets.

So among these 100 million planets, are there any planets that are completely consistent with the internal and external conditions of the Earth? In fact, there are countless galaxies like the Milky Way in the entire universe. According to the theory of probability, we can think that there must be celestial bodies in the universe that are the same or similar to the earth in addition to the earth, that is, there must be living planets like the earth in the universe, but we have not discovered each other.

What, then, is the best way to connect with each other in the vast universe? In terms of human wisdom and scientific and technological level, the best means is electromagnetic wave communication. Radio telescopes currently in use can receive very faint signals from space, but unfortunately, there is no indication that these signals carry information from advanced intelligent beings.

Another way is to compile symbols that represent the characteristics of the earth into "passwords" to make "earth business cards" and use electromagnetic waves to emit them into outer space. If aliens are about as intelligent as humans, they have the opportunity to receive and decipher the content of our signals, and then they send them to Earth. But even if electromagnetic waves are emitted by the nearest star of exactly the same type as the Sun, it would take light-years to reach Earth.

Suppose this star has planets, and there are highly intelligent life on the planets, and they receive signals and feedback information, and a round trip is light-years. Therefore, it is almost impossible for humans to meet them. Is there only one life in the universe that exists on Earth?

The characteristics of living matter on earth are organic matter with hydrocarbons as the main body, oxygen as the exchange material for metabolism, and water as the basic substance for the formation of life. After these conditions are met, at the right temperature, organisms can be formed. If life could be formed from other substances, it would certainly not be in environmental conditions like Earth.

But as long as they are living beings, they must also exchange matter and energy to maintain life activities. All in all, theoretically, earthlings are not lonely, and there may be "aliens" in the universe. But in practice, so far, no life on other planets has been discovered, let alone "aliens" visiting Earth.