Why do some people say that looking up at the stars means looking at the past?

We look up at the starry sky and see the stars, and when we think about it, what we see is only what they used to be, and we don't know how it is now, if a star has become a supernova ** into a neutron star or a black hole, it is impossible to receive this news at the same time on Earth.

This phenomenon can be explained by the temporal light cone model, where the world we live in can be seen as a four-dimensional space-time, that is, three-dimensional space plus one-dimensional time, with the z-axis as the time axis and the x-axis and y-axis as three-dimensional space. The occurrence of any event in the universe can be represented by a temporal light cone.

To take the simplest example: the earth revolves around the sun, the orbit is elliptical, the average distance is 100 million kilometers, and it takes about 8 minutes and 20 seconds for light to reach the earth from the surface of the sun. If the sun disappears suddenly, then the event will occur after 8 minutes and 20 seconds before the earth receives this information, for example, the whole earth enters a dark hour, and the earth leaves its original orbit.

Only those who enter the event's future light cone can be affected by this event, and anything outside of the event's future light cone is temporarily unaffected.

The same is true for a star 17 light-years away, which we see on Earth, just as it was 17 years ago (the expansion of the universe is not taken into account here). This is easy to understand, and it also exists in everyday life. Everyone we see is the same as they used to be, but because the distance is relatively short, and the speed of light is 300,000 kilometers per second, and it can circle the earth more than seven times in one second, the time delay caused is almost negligible, and what we see is only what it was a second ago.

Theoretically speaking, everything that happens on the earth is flying to outer space at the speed of light, if there is a super civilization 2000 light years away from the earth, they can see what is happening on the earth, then what they see is the earth more than 2000 years ago, at that time is the Qin Dynasty period in China, they may see the registration of Qin Shi Huang, and they may also see the prosperity of the Tang Dynasty. But the things that are happening on Earth now, such as the fact that we have developed to the point where we can fly off the Earth, achieve a manned landing on the moon, and so on, these events are not visible to them.

It is the same reason for us to detect distant celestial bodies, even if human science and technology can detect civilizations tens of thousands of light-years away in the future, even if we see that they are in primitive societies, we cannot take it lightly, because distance means time difference. So the question is very simple, a star 17 light years away from us, we only see what it was 17 years ago. Because of the limitation of the speed of light, we can never go beyond the light cone of time and know in advance what has happened, because according to Einstein's theory of relativity, an object with a resting mass can never reach the speed of light.

Then we will never be able to look back at the earth beyond the speed of light, go to see the registration of Qin Shi Huang, and see the prosperity of the Tang Dynasty. I've seen a very interesting statement before, if the technology develops to a certain extent in the future, and the wormhole is found to travel thousands of light years away, then looking back at the earth may see what the earth used to look like, isn't this a new way of archaeology?

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Because the starry sky is very vast, and the range that can be reached by the human eye is also very far, in this kind of observation, the human brain is very empty, which will cause a lot of thinking.

Looking up at the starry sky is looking at the past, which is actually very destructive, but from a physical point of view, the phenomenon we see now is not the practice we feel at the moment. Because the farther away from us, the more delayed the scene we see, for example, the Big Dipper is very far away from the earth, it is not a star in the solar system, it is a star, but there are some small celestial bodies that are relatively close to the earth, such as the moon, it will not have much delay.

Because looking at the starry sky is feeling the speed of light, and there is an illusion in front of you. It feels as if time has suddenly stood still, but it's true. You can have some feelings about the past, but it's not an illusion.

Because the stars are far enough away from us, and the past is far away. So, when we start to feel nostalgic for the past, look at the stars. Because there may be people watching us there.

It is also because the stars are far away from our earth, so we humans cannot reach the same range with the naked eye, so we can only look up at the stars at night when we think about something, and there will be a lot of imagination.

What does "stargazing" mean?

Hello, "looking up at the stars" means looking up at the sky full of stars. At a certain time, it means that people should have dreams, yearn for a better and happier life, refer to an upward and positive attitude towards life, and also represent serious thinking. The subject of this word is that there are many things in the heart of those who look up at the starry sky, and in the deep starry sky, people's minds can get quiet thinking.

Looking up at the starry sky, of course, what you see is the sky full of stars, but the vast starry sky, starry, none of them is their own star, each star is very ordinary but very unique, just like each of us, as ordinary as the stars, not outstanding.

Inadvertently, autumn has deepened, after sunset, the night sky lights up with small twinkles shining in the silent autumn night sky, when you look up at the starry sky, what do you think? Is it a story about the stars? A reflection on the infinite starry sky?

Or maybe you want to travel in space.

Exploring the mysteries of the starry sky? A story: Jiu'er is an unobtrusive, quiet little girl, how did she fall into the water and be swept away by the water and become a star in the sky? This is the story that "Xing Jiu'er" is going to tell.

Once upon a time, in the northernmost part of Akita, there was a little girl named Hisa.

She is a silent little girl who does not like to talk, and she is always the last to enter the house and sit quietly at the back of the house. But when she sees a neighbor's child being bitten by a dog, she will rush up and protect the child with her body. Unbeknownst to her mother, she blamed her for getting all over her body.

She didn't say anything either. One summer, it rained so hard that the river in the village swelled so much that it was about to flood its banks. Jiu'er, who went out to mow the grass, did not come back in the evening.

Later, witnesses saw a little girl fall into the water and be swept away by the water. After that, there was always a star shining at night there.

I think of Zhang Jie's song, the lyrics are.

On this day I began to look up at the stars and discover).

The stars are not far away, the dream is not far away, as long as you stand on tiptoe)

I believe that a pair of hands have gently led me to you.

I believe there is a thread that connects dreams with reality.

I believe that there is a kind of fate that will make all the accidents come true.

I believe it was on this day that fate began to change.

On this day I began to look up at the stars and discover).

The stars are not far away, the dream is not far away, as long as you stand on tiptoe)

I was no longer hesitant or shy.

Fly higher with your arms and see farther with you.

Begin to look up at the starry sky and feel the time and space of love.

Find the brightest spots in your life.

I want to play in the sky. It's like watching TV, you can walk on the clouds.

Looking up at the starry sky is actually looking up at the starry sky. There is nothing esoteric about him in his own right. But in a certain environment, he expresses a lot of things in the heart of the subject, that is, the person who looks up to the starry sky.

People can observe meteorological or astronomical phenomena in the sky to know how the weather changes, the passage of time, or their own direction.

The sun rises and sets to know the time of day, and the waxing and waning of the moon at night can know the time of the month. The Big Dipper can indicate the north. The thickness and shape of the clouds can tell if it will rain or not.

Many beautiful phenomena can be enjoyed in the sky, such as rainbows, aurora aurora and meteor showers. Birds will fly in the sky.

Related information

The sky has a variety of expressions, it is carrying the light that is the fastest in human understanding, and it is the most primitive creative enlightener of human beings. The various forms are usually expressed in terms of weather, which refers to the specific state of the atmosphere in a certain place close to the earth's surface in a short period of time. Weather phenomena refer to various natural phenomena that occur in the atmosphere, that is, the comprehensive performance of the spatial distribution of various meteorological elements in the atmosphere in a certain instant.

Weather processes are the process of changing weather phenomena in a certain area over time. All kinds of weather systems have certain spatial and temporal scales, and the various scale systems are intertwined and interact with each other. The combination of many weather systems constitutes a large-scale weather situation that constitutes the atmospheric circulation of the hemisphere or even the world.

Weather systems are always in the process of rebirth, development and disappearance, and have their corresponding distribution of weather phenomena at different stages of development.

I saw the stars, dreamlike, and intoxicatingly beautiful. I think of the vastness, vastness, boundlessness, and endless nature of the universe.

"Starry Night" is one of the masterpieces of the post-impressionist painter Van Gogh. In this painting, Van Gogh uses exaggerated techniques to vividly depict the starry sky full of movement and change. The night sky is high and far, big stars and small stars swirl in the night sky, the golden full moon forms a huge whirlpool, and the first line of the nebula is tangled and hovering, as if letting people see the passage of time.

The dark greenish-brown cypress trees resemble huge flames and are the responders to the starry night revelry. Under the sky, the sleeping village is so peaceful and serene. The pale blue tones and dynamic lines give people a sense of freedom in time and space.

Background: On May 8, 1889, after a second mental breakdown, Van Gogh went to Saint-Rémy, 25 km from Arles, to voluntarily undergo mental illness**. At that time, the doctor allowed him to go out and sketch during the day, and after a month in the hospital, he painted this painting, and the village in the painting is Saint-Rémy.

When you look up at the starry sky, you see, of course, the sky is full of stars. However, the vast starry sky and the stars are dotted, and none of them is their own star. Each star is mundane but unique.

Just like each of us, we are as ordinary as the stars and not outstanding. But exudes its own uniqueness, its own distinctiveness. Be yourself and let yourself be like a star to decorate your own night sky, and there will be extraordinary results.

Summary. "Looking up at the stars" means looking up at a sky full of stars. Refers to an upward, positive attitude towards life. The meaning of "looking up" is: looking up, looking up, looking up and expecting. "Starry sky": Refers to the sky with starlight.

What does "stargazing" mean?

"Looking up at the stars" means looking up at a sky full of stars. Refers to an upward, positive attitude towards life. The meaning of "looking up" is: looking up, looking up, looking up and expecting. "Starry sky": Refers to the sky with starlight.

The German philosopher Hegel said that a nation can only have hope if it has those who pay attention to the sky. If a nation is only concerned with what is happening at its feet, it has no future.

At a certain time, it means that people should have dreams and yearn for a beautiful and happy life.

"Looking up at the stars" means looking up at a sky full of stars. "Looking up" means looking up, looking up and expecting. "Starry sky": Refers to the sky with starlight.

Sentence formation: 1. I once looked up at the starry sky with my friends, and then we burst into tears, he was out of love, and I was because I sprained my neck.

2. Although lovelorn people are different, looking up at the stars is the only one.

3. Looking up at the starry sky, I discovered the brilliant secret of the universe; Looking up at the white clouds, I know behind the clear blue sky; Looking up at my father, I lifted the heat behind his father's dust.

4. Only those who never look up at the starry sky will not fall into the pit.

5. Amorous meteors streak across the sky, leaving a trace of light, just want you to look up at the starry sky, you can make a wish in your heart.