Lead
The speed of light is extremely fast, and when we talk about this speed, I am afraid that there is no object in the universe that can compare to light.
This is also the result of zero changes in the environment and scene that light experiences when it travels.
But if you give light a light-year distance, how long does it take?
Light-year.
This question has never been heard of before, and no one has ever had any doubts about the speed at which light travels.
However, after the exploration of the universe, the answer to this question is already available.
Light-year may be the most familiar cosmic word to humans, but people may not know much about light-year as a unit of distance.
Light-years are defined by the distance that light travels in a year in a vacuum, 1 light-year is equal to 9.461×10^15 meters, to help us feel how big this number is, if you make a very, very long wire 1 light-year long, then this wire will elongate 3 million kilometers in a year.
And, as a classic example, if a star is 1 meter away from our Sun, then the length of the galaxy is 405,000 kilometers.
This number is obviously a very long distance from the Earth, and it is for this reason that the light year is talked about by people, because it can help people better feel the vastness of the universe.
The distance from the Earth to the Moon is 384,000 kilometers, which means that if the longest cable of a million cables were to reach a planet, then the planet would be about a light year away.
Looking at this number from this example, I am afraid it is difficult for people to have an intuitive understanding of this number.
What does the universe look like?
Why does it take so long for light to trek this extremely wide waterway?
This is the root cause of all this.
Light-years away.
The universe as we know it is just an earthly planet on an infinite "crystal ball", and there are countless planets on top of this infinite "crystal ball".
No one has ever seen the mysterious queen of light years, but that doesn't prevent us from making an estimate of this stage through some known conditions, light years.
There are very few regular planets in the universe that are light-years of these planets, so there are not many such planets, but the distance specified by the light-year is the only unit of distance used to calculate the distance between these planets.
Therefore, the distance of light years is still so far away in people's hearts.
Like the Sun, a light-year is a means of transmitting information directly between stars.
In the night sky, although it does not shine as brightly as other asteroids, the Sun is also very high in the light year, saving a lot of distance, allowing the green planet to have an advantage in light years, after all, if it is not far from the Sun, it is light-years away from the light-years away than other stars.
Therefore, this extremely magical number must also be remembered by people because of this magical characteristic.
This hateful and cute feeling always brings people an ambivalent mentality and draws attention to it.
It is precisely because there is such a strong interest in light years that the question of light years is not very difficult to explore.
The physical properties of the nearest star can already reveal the mystery of light years, and what other mysteries are unknown about light years?
In the subsequent exploration, we can have a deeper understanding of light years.
The reason why light-year can be valued by so many people is because light-year is the basis for human astronautics, but human beings who have just entered space are still staying in the most down-to-earth way, is light-year really worthy of such a sensation?
Naturally, those more down-to-earth methods will not involve light years, but light years are talked about, so how does this mysterious number make people talk about it?
If people open up a new way of navigation in spaceflight, then mankind's understanding of light years will be more deeply rooted in people's hearts, and in the process, what benefits will light years bring to mankind?
Time.
Light-years is a very distant and mysterious existence for humans, but for light, it is not just a moment's work.
When a beam of light enters the depths of the universe, the time experienced by light in the universe is also very short, even from the perspective of earthling's dosage, it only takes about 1.28 seconds for light to walk around the moon, so the same time for light to walk a light year is only 1 year, and for light, there is no feeling during this period.
Just as in the human world, 1 second is fleeting, and 1 minute is fleeting, and for light, 1 light year is no more than that.
In other words, if there is anything bad about light-year, it is the distance and time that are its fatal wounds.
epilogue
The content of just a light year is normal, and there is nothing more mysterious and incredible than this.
Therefore, this distance is also part of its existence, as long as it is gone, then everything in light will be changed, so that there is no sense of mystery.