The earth is a beautiful blue planet. There are many creatures on the earth, including marine organisms , terrestrial organisms, amphibian organisms and microorganisms, etc. Human beings are the wisest life on the earth. Since their birth, human beings have been I began to explore the mystery of the world. After humans walked out of the earth, humans realized that the earth was not the only world. There was a universe outside the earth. In order to explore the mystery of the universe, scientists also made a lot of efforts, and once in 45 A few years ago, scientists launched the Voyager 1 probe outside the solar system. The purpose of launching this probe was to let it fly out of the solar system and explore the mysteries outside the solar system. At that time, scientists installed gold on the Voyager 1 probe. record.
On this golden record, there is the location of the earth, the sound of nature, the sound of humans, and the sound of animals. At that time, many people thought that this golden record might bring disaster to the earth, but now it seems that we are thinking too much Because so far, the Voyager One probe has not yet flew out of the solar system. Scientists calculated that according to the current flight speed of the Voyager One probe, it will take at least tens of thousands of years to completely fly out of the solar system. Time, tens of thousands of years are too long for humans. Although the Voyager 1 probe did not fly out of the solar system, it constantly sends information back to the earth during its flight, and this information is studied by humans. The solar system is very important.
Voyager 1 detector took a photo of the earth 6.4 billion kilometers away from the earth. After this photo was transmitted back, many scientists were shocked. In this photo, it is difficult for humans to find the earth. Because the figure is too far away, the earth is only as big as 0.12 pixels. Can we imagine how big is 0.12 pixels? Maybe friends who are interested in photography should know that 0.12 pixels are similar to a piece of white paper. I clicked it gently with a pencil. Anyway, I just can't see it clearly. Unless you keep staring at it, you can see a dot. Later, the scientists put it This point is called dull blue, because the earth looks like a blue planet in the universe, so it looks like a dull blue at such a distance.
Even the famous physicist Carl sighed after seeing this photo: Our mood, our pride, and the feeling of having a special status in the universe are all challenged by this dim blue dot. What he said is indeed very reasonable, and I believe everyone will have thoughts about this photo. We are the wisest life on earth, and have become the overlords of the earth after being born millions of years. However, facing the vast universe, we still seem very small. The Voyager 1 probe has flew 23.1 billion kilometers. Where will it fly in the future? Scientists don't know now, but scientists believe that the battery on the Voyager 1 detector is almost used up.
If the Voyager 1 detector battery is used up, it will never send us information back. According to humans' existing understanding of the universe, scientists believe that in the universe, in addition to life on Earth, it must also be Extraterrestrial life exists. Scientists believe that the reason why the Earth can give birth to life is mainly because the Earth meets the basic conditions for the birth of life. These three basic conditions are appropriate temperature, sufficient air and abundant water resources. If other planets also If these three basic conditions are met, it is very likely that other planets will have life.
There are so many planets in the universe that cannot count. Take our Milky Way as an example. In the Milky Way, there are about 100 billion stars and more than 40 billion planets. Among so many planets, is it only the Earth? A planet gave birth to life? This is obviously impossible, and scientists have discovered through research that the solar system belongs to a remote area of the Milky Way. Why do you say that? Because the solar system is about 26,000 light-years away from the center of the Milky Way, many friends may have a question when they see this, that is, the diameter of the Milky Way reaches 200,000 light-years, while the solar system is only 26,000 light-years away from the center of the Milky Way. Why is the solar system in the Milky Way? What about remote areas? After research, scientists found that in the Milky Way, the distribution of celestial bodies is uneven. In the core area of 1 second away from the center of the Milky Way (about 3.26 light-years), the density of stars reaches 289,000 per cubic light-year.
When the distance increases to the 40-second gap, the density of the star drops to 288 per cubic light-year. When the distance increases to the 100-second gap, the density of the star is only 2.9 cubic light-years, and the solar system is about the center of the Milky Way. 26,000 light-years, in this area, the density of stars has dropped to 0.004 cubic light-years, which means there are very few stars near the solar system, which is equivalent to urban areas and suburbs. Our solar system is in the suburbs, so if our The solar system is at the center of the Milky Way. Is it a good or a bad thing for life on Earth? Some scientists believe that if the Earth is located in the central region of the Milky Way, it is not a good thing for the Earth.
Scientists speculate that in the central area of the Milky Way, there should be a large number of alien life, and their civilization level may be higher than that of human civilization level. Generally speaking, the development of any civilization is inseparable from resources. There are a large number of resources in the central area of the Milky Way, so when a civilization's technology has reached a certain level, they will definitely go to the central area of the Milky Way, so that more resources can be used. Perhaps interstellar areas often occur in the central area of the Milky Way. It's a big battle, so we'd better stay away from the center of the galaxy.
And the Milky Way is just a small galaxy in the universe, and there are many galaxies larger than the Milky Way, such as galaxy group , Virgo super galaxy cluster , etc. Currently, humans can observe the diameter of the universe about 93 billion lights. In 2018, this range is simply astronomical to humans, and this is only part of the universe. Scientists do not know how big the universe is. After research, scientists have found that our universe is still expanding so far. In the early 20th century, American physicist Edwin Hubble discovered that the spectra in galaxies showed a redshift phenomenon in the galaxies, which showed that these galaxies were far away from us.
After seeing this phenomenon, Edwin Hubble put forward a bold conjecture, that is, our universe is still expanding. After this theory was proposed, many scientists could not believe it. Many scientists had a lot of scientists about galaxies. After observation, we finally found that Edwin Hubble's theory is correct. This theory has given humans a new understanding of the universe, but also made scientists feel very desperate. After all, if the universe continues to expand, we will always be The edge of the universe was also found.
