Looking at the earth from the moon, why do some people say they are afraid? What are you afraid of?

The average distance between the earth and the moon is 384,403.9 kilometers, perigee is 363,000 kilometers, and apogee is 406,000 kilometers. Standing on the earth to see the moon is completely different from looking at the earth on the moon, mainly because of their different line of sight angles and different effects.

So there is the question of good-looking and bad-looking. When we look at the moon from the earth, it is always beautiful and bright, and even under the "same effect" of some celestial bodies, it will usher in the most beautiful natural wonders.

So we see that the total lunar eclipse, the full moon and so on all have the same effect. Now there is a saying that there is a kind of "fear" when looking at the earth from the moon. In fact, strictly speaking, it's just that we can't look at the earth from the perspective of the moon, so this "psychological" fear is formed.

The moon looks at the earth, why do some people say they will feel scared? What are you afraid of? The earliest observation of the earth from the moon can be traced back to 1972. The Apollo program of the United States has already taken pictures of us, so we have seen more than one picture of the earth from the moon. So why do some people say that they are afraid? What are you afraid of?

In fact, the biggest fear is to see the earth rise from the moon level. At this time, we already know that from the surface of the moon, the earth never rises or sets. Because the moon always faces the earth, the earth will always be in the same position above the horizontal line and move slightly with the slight shaking of the moon.

So we can't see the concrete changes between the moon and the earth at all, because they are relative and the moon itself is a dark pattern. When we see the earth, we seem to see "light". The earth you see is more than 50 times brighter than the moon. Coupled with the shaking effect, you may feel that the whole earth will be pushed to the moon, so it gives people a "sense of oppression", that is, some people say that looking at the earth from the moon will make them feel scared. To be precise, it's just that everyone's mental state is different, so this feeling is produced.

What is the relationship between the moon and the earth? Both are equivalent to "twins". According to scientific research, "twins" may be separated in the future, because scientists have discovered that the moon will be farther and farther away from the earth, because the earth's rotation is getting slower and slower, about 3.8 centimeters away from the earth every year.

So in the final analysis, it is not a good thing for the earth. The reason why the moon is getting farther and farther away from the earth is that the tides on the earth twice a day are caused by the gravity between the earth and the moon. This huge energy is consumed every day, and the earth's ability to bind the moon is getting weaker and weaker, and the center of mass of the whole earth-moon system will be farther and farther away from the earth.

So in the end, the earth and the moon may separate, and then the tides on the earth will be lost, which is not a good thing for our earth. Tides maintain the changes of the earth's ecosystem. Without the influence of tides, it will appear and may have an impact on the four seasons of the earth. Therefore, due to the controversy of tides, some scientists proposed to destroy the moon directly. From the new research, it will eventually be far away from the earth, without human hands.

So in the final analysis, the relationship between the moon and the earth can't be lost now. Once lost, the earth will cause these changes and great changes. I don't know if the moon and the earth studied by scientists are far away and will eventually happen. If it really happens, the earth may undergo earth-shaking changes, which is an indisputable fact.

The future of the earth may be even more terrible? In addition to what we have said above, there may be a series of impacts, and the future of the earth is indeed very worrying for mankind. The earth has experienced five mass extinctions, and almost all life has not got rid of these five mass extinctions, so most creatures have become extinct or disappeared.

Since the extinction of dinosaurs, a new round of life has reappeared, but more and more scientific research shows that a new round of extinction on our planet may come again, that is, the sixth extinction on our planet.

It is a fact that we see more and more animals and plants disappearing, so these conclusions tell us that if there is a mass extinction on the earth, the future will be even more terrible for us, and we are also a link in the biological chain. Once there is a mass extinction, it will definitely have an impact, so there is nothing more terrible than the sixth mass extinction on earth. Now the scientific community is calling for protecting the earth and the ecological environment to worry about this problem, and the Mars migration plan is also to prevent this.

Generally speaking, the future of the earth is the most frightening. It is normal for human beings to see the earth from the moon now. In fact, it can only be said that some people will feel fear, but these are normal situations, so worrying about the future direction of the earth is the most important thing. If there is inevitable extinction, you should be prepared psychologically.

Seeing the earth from the moon, why are you afraid? What are you afraid of?

So far, a total of 12 people have seen the earth with their own eyes from the surface of the moon, but they have seen more than this number in the orbit of the moon. For example, Apollo 13, three astronauts went to the moon and returned to the earth. Of course, their experience is not as easy as the author said! When every astronaut who came back from the moon talked about the feeling of seeing the earth on the surface of the moon, shock was the same view!

What's it like to see the earth on the moon? It is unrealistic to see the earth accurately on the moon, because astronauts are used to the sun rising and setting on the earth, and the moon goes up the mountain at different times and places every day, but they are not used to it. There are two reasons. First, the sun goes very slowly. It takes about 7 days to rise from the horizon to the top of the head, and it takes 7 days to slowly fall below the horizon!

A day on the moon is very long, so you can muddle along.

The other is that the earth looks more than 50 times brighter than the moon, and its area is 16 times that of the moon. But what is even more strange is that the earth is still in the moon sky, and its position in the moon sky will not change no matter how long you wait. Of course, there are still some changes in the appearance of the earth's rotation. But don't wait until the earth goes down, or you will have to go all the way down.

This is all because the moon is tidal locking by the earth, and it is due to the drag of the tidal force of the earth on the moon's rotation, which leads to the moon's rotation becoming slower and slower until it finally synchronizes with the moon's revolution around the earth. So the affectionate moon has been staring at the earth for many years. Don't you see the moon's mind?

Fear from the heart or anxiety of civilization? Of course, as astronauts, we have long known this result, because these are all scientific common sense, so when we consider this feeling from their point of view, we will never use the usual saying "lying in the trough, looking good"? Besides this word, can you think of adjectives of NB? This article collects the first sentence when you walk down the gangway on your next trip to the moon! "Wocao, beautiful" and "Wocao, NB" don't count, because the flower shop has already said it!

Life in danger

Seeing the earth from the moon is more emotional, but after feeling it, I feel deeply uneasy. It never occurred to me that there are nearly 4 billion people living in this blue ball (the population of the earth was less than 4 billion when Apollo landed on the moon), and it has been orbiting the sun in the dark universe for more than 4 billion years. If there is no accident, it will continue to run in the future.

Life has been more than 3 billion years since the birth of the earth. A life born by coincidence has experienced the most primitive DNA to single-celled life, then from anaerobic life to aerobic life, and from plants to animals. It has experienced the Cambrian life explosion, five mass extinctions and countless small and medium extinctions, and human civilization has finally been born.

At least one large-scale extinction was caused by the universe, and many of countless small-scale extinctions were threatened by space. Near the earth's orbit, asteroids are bustling and pushing each other. It's a miracle that life can thrive on this blue planet for so long, isn't it?

Lonely earth

The universe is so vast. The diameter of the sun is as high as 65.438+0.4 billion kilometers, but the viewing angle on the earth is only 0.5 degrees, because the distance between them is 65.438+0.5 billion kilometers, and the nearest star, proxima centauri, is as high as 4.2 light years. Moreover, the Milky Way is as big as 200,000 light years, and the Hubble volume exceeds the imagination of 93 billion light years!

But it seems that there are only humans in the universe? Otherwise, aliens haven't come to humans for so long? It's not that they dislike that human beings are too backward (it looks more horrible, just like being watched in a goldfish bowl, but they don't feel anything), so another conclusion is that maybe it's just human beings? Fermi once sighed, "Where are they?"

Pale Blue Dot

1February, 990 14, when the traveler finished all the tasks and prepared to fly to the busy universe, he looked back at the solar system and took a famous photo. This is the famous "dim blue dot" photo of the earth that inspired carl sagan. In fact, if you don't circle it, no one can find that the earth is hidden in the dazzling light of the sun!

The blue circle is the earth.

The light blue spot is where the traveler is.

Whether there is other life in the universe or not, the earth is unique to human beings. Now that human beings have developed into the space age under its protection, which day can human beings protect the earth in turn?

Looking at the earth from the moon, why do some people say they are afraid? What are you afraid of? So far, only 12 astronauts have landed on the surface of the moon, which is the Apollo manned moon landing program of NASA in the last century. During the period of 1969- 1972, * * successfully carried out six manned landings on the moon, and each time there were three astronauts but one of them stayed in the command module of the lunar orbit, so only two astronauts set foot on the moon and left footprints.

Not only that, the last three manned landings on the moon even brought it out. The lunar rover here is different from the Yutu in China. Their lunar rover is a scooter, so that it can be moved a little farther from the landing site.

In fact, we can find some photos taken on the moon during the Apollo manned moon landing program. If the photos are mainly astronauts and landers, the sky is black in the distance and no stars can be seen. So this makes many people wonder, in fact, this is the simplest exposure problem.

Back to the topic, what would it be like to look back at the earth on the moon? Only a dozen people have looked back at the moon at a distance of 380 thousand kilometers from the moon or its orbit. All we can see is photos and scientific understanding of what it would be like to look back at the earth.

First of all, let's put a very famous photo of the earth, which was taken by the astronauts on the apollo 8 on February 24th 1968. Apollo 8 didn't carry out the manned mission to the moon, but just moved around the moon, making preparations for verification in advance. Apollo 8 took this photo while flying around the moon in an orbit 109 km from the surface of the moon.

From the photos, our earth is very beautiful, just like a porcelain plate, and we can even distinguish the mainland from the ocean. Personally, if you look back at the earth from the moon and feel scared, the main reason should still be "homesickness", because the current celestial environment is relatively bad, there is no atmosphere close to absolute vacuum, followed by no direct sunlight, and the temperature difference between day and night is 300 degrees Celsius. These conditions can't make human beings survive. The only thing that protects us is our spacesuit. When we see the earth hanging on the moon and the sky, we always remind ourselves that we are far from home and stand on different stars, so of course we should be afraid.

Then there is the feeling that seeing the moon on the earth is completely different from seeing the earth on the moon. This is a scene that human beings have never experienced before. The apparent diameter of the moon is about 0.52 degrees (the unit obtained by dividing the diameter of the moon by the distance between the earth and the moon is radians, each radian is about 57.32 degrees, and the final result is 0.52 degrees). According to the same method, the apparent diameter of the earth is about 1.9 degrees. In contrast, looking back at the earth from the moon is almost 14 times that of the full moon.

Looking back at the earth on the moon has a different feeling, because there is no atmosphere on the moon, which means that the sky is dark even during the day, and it is very abrupt to see the bright earth with a large apparent diameter. Then the moon was tidal locking by the earth, which caused the moon to rotate exactly equal to period of revolution, so a day and night is about 30 days, which is very long.

At the same time, if you can always see the earth hanging in the sky on the front of the moon, you can even feel the rotation of the earth. You can move a chair and sit on the moon and watch the seven continents and four oceans pass by. But if you are on the back of the moon, it is difficult to see the existence of the earth. Therefore, the fear of looking back at the earth on the moon comes from inner pressure, just like the safety protection measures are in place during bungee jumping, but we dare not jump down easily and look down easily.

In fact, looking back at the moons closer to Jupiter and Saturn, especially Jupiter's Great Red Spot, is even more frightening.