The stars are far away from us. Why can our eyes see stars billions of light-years away?

Why can you breathe air with your mouth open? Because the air is always there and everywhere, you can breathe it wherever you go.

In the same way, why can you see distant stars with your eyes open? Because it always emits visible light, you can see them when you open your eyes. If he doesn't radiate visible light, you can't even see those telescopes.

Why is the universe observed by humans only about 1000 billion light years? That's because light beyond/kloc-0.000 billion light years has not reached the earth. Therefore, it can be speculated that the universe is too big for human IQ to imagine. Stars don't start to shine on you just because you want to see them. Whether you look at it or not, it has been emitting light and heat there for hundreds of millions of years.

Just like you can drink the Yangtze River water from the snowy plateau at any time in Shanghai, because the Yangtze River will not set off from its birthplace to the estuary because you "want to drink water", but you only drink the bowl of water that flowed down from its birthplace a few months ago.

Just like drinking tap water at home, water plants supply water to thousands of households all the time. The water you want to drink is not the water from the water factory, but it will arrive at your home in an instant. The water you turned on the tap may have been made a few days ago, and it took you several days to walk on the road. In the future, it was a reality in the Qin and Han Dynasties that human beings invented a spaceship with faster than light speed and flew out of 1000 light years to return to Earth. Once human beings can travel in the universe, they will never return to this era. This is what experts tell us about cosmic time.

According to Einstein's theory, the speed of light can keep time still, so in the process of light movement, time should remain still. Then, when light reaches the speed of light and time stands still, shouldn't the light we see be produced immediately? In other words, no matter how far away, everything we see is being produced.

Everything we see is the reflection of light on our eyes. Many times, what we call looking is essentially to distinguish the light that actively hits our eyes and find out what you want. You know that light has speed, just because it is very fast, 300 thousand kilometers per second, so you won't feel such a difference in a short distance, you will feel that what you see is synchronous with you, which is not the case. Just like thunder, the sound you hear from lightning is out of sync, and so is light.

An object is one kilometer away from us, and when we see it, it is actually1/300,000 seconds ago. The distance to the moon is 380,000 kilometers. What we look up at is actually the moon 380,000/300,000 seconds ago. What people say that seeing is believing is actually wrong, because it is no longer in that universe, even a little, a little. The farther you go, the more you can feel it, just like the sun. When you see it jump out of the horizon, because you see the sun eight minutes ago, its actual position should be eight minutes later. We see many stars today, but what we see is their souls, because in fact, many of them don't exist.

In fact, many of the stars we can see now no longer exist! Because what we see is the light emitted by stars hundreds of thousands or millions of years ago, which may be destroyed and disappeared for various reasons during this time!

Two problems: the universe has been born for more than 65.438+038 billion years. At present, all we can see is the celestial bodies that have passed through 65.438+038 billion years. First, how do we judge how many light-years away the celestial body we see is, that is, how many light-years before a celestial body reaches our eyes? Second, if you see the light 65.438+038 billion years ago, although there is a distance, in terms of time, it is the time when the universe exploded. Isn't that the big bang we saw?

The structure of the human eye determines the visual limit. Under excellent conditions, human eyes can see candlelight 27 kilometers away and satellites at a height of 1000 kilometers in the dark. Most of the stars we see are stars in the Milky Way and planets and asteroids in the solar system.

A star outside the milky way galaxy is invisible to the naked eye. There are only a few visible extragalactic galaxies, such as Andromeda galaxy, Magellanic galaxy in the southern sky, and Windmill galaxy. We are just a blur. Individual stars are hidden in the light of galaxies and cannot be distinguished by human eyes.

The light we see actually reaches our eyes. It has been ten minutes since the sun shone on everything on the ground, including our eyes. In other words, we can only see the sun ten minutes ago. When can we see the stars? Light speed divided by distance! Let's lie on the court at night, look at the vast starry sky and think about time and space in the universe. Think about it, and you will agree with me. In the universe, time and space can be completely transformed. They are two sides of a piece of paper. At the same time, this concept can only be a hypothesis in the universe. People half a world away from us can talk and video call at the same time, but what about two people on two planets separated by 100 light years in the universe? Think about it. Is it horrible?

At the same time? When you saw the message he sent at the speed of light, he had been dead for many years. When he saw the message you gave him, you were already gone. If you can send messages and call each other at the same time, it will be a long time after everyone dies. If the distance is shortened by half, we can talk to each other in our lifetime, and we will not hear his reply until 50 years later, and we will have to wait another 50 years.

If you put aside all distractions and your own low-level desires in the world and really think about it, then you will find that what I said is very good, but it is still inaccurate, and it is difficult for you to correct it. Go back to utilitarian life. This will at least break a popular fantasy or superstition that aliens have visited or are visiting the earth, and we can emigrate to aliens in the future. If there is life or human beings on another planet. Then at least tens of thousands of light-years apart, even if there is a UFO with the speed of light, it will take tens of thousands of years to reach the earth. Do they have that life?

Would you still believe it if there was? What about us? Do we still believe in the temptation to move to another planet? Don't they just want to make some money? It is those of us who don't like thinking and are too credulous that make people rich by fooling and fabricating. Do you know how many people have changed from poor scholars to scholars because of UFO scams? If you don't want to fool the public with a little knowledge, look up at the stars like me. Although the body can't cross, our minds can fly freely, right?

Because seeing an object is not the light from the eyes, but when the light of the object reaches the eyes, just like the light of the sun has reached the earth, so you can see the sun when you look up, and you don't need eight points anymore. Even if a star is a light-year away from the earth, people don't need a year to see it. You can see it at any time.

It stands to reason that the starlight we see is the light from a planet hundreds of millions of light years away, or billions or even billions of light years away. That is to say, it is said that this planet was hundreds of millions of years ago. However, many planets are not expected to exist for such a long time. So are the planets seen by scientists through telescopes now or before, or are some planets destroyed? Can we still see their light now?

The universe may not be a vacuum as we know it now. There may be some unknown matter, so when light passes through this layer of matter, it will be accelerated or enhanced. Our understanding of the physical characteristics of the speed of light may be the characteristics of the solar system, so after reaching a certain position and a certain area, the physical characteristics of the speed of light will change, which is not what we think now!

If quantum is used as a signal source to transmit to the earth at the edge of the universe, how long do you think it will take for the earth to receive it? I tell you, in a flash, maybe less than a second. This is the quantum science that scientists are exploring! Quantum is a very awesome and magical future science!

What areas did the solar system lead us through 10 thousand years ago? 10,000 years later, we saw those lights, but we don't know where we are now. Maybe the Milky Way and other galaxies are spinning around an unknown substance, or they may be heading for a destination. We are all passers-by, the sun is a passer-by, the earth is also a passer-by, the solar system is also a passer-by, and perhaps the universe in which we exist is also a passer-by. No one knows where the real center or the real boundary is. Humans are too small, the earth is too small, the solar system is not big, the Milky Way does not necessarily have nothing, and there is not necessarily only one universe.

The speed of light in time and space is not the fastest, but it is faster than that in space, that is, the three-dimensional speed of light in space. It appears in the form of parabola, runs at the speed of refraction and reflection, and only propagates under dark matter and dark energy. It is faster than the speed of light and the spectrum known to mankind, and it is trillions of times brighter. If human beings master the speed of light through space, they can realize the possibility of crossing the galaxy and the universe. The origin of the universe comes from all kinds of energy, which comes from matter, while matter comes from light cluster, light cluster comes from nuclear change, nuclear change comes from the Big Bang, and the Big Bang comes from space, and space comes from suction, suction comes from mass balance, and mass balance comes from gravity.