Since the dawn of civilization, we have been gazing at the stars in the night sky and tracking the movements of the planets. This documentary explains the knowledge and wonders of the universe in a very romantic and unpretentious way, which is so intoxicating. I don't think Sheldon chose to be an astrophysicist because not just because it doesn't work in extreme environments, you're also blown away by the beauty of the universe, so be it.
What impresses me most in the film is that in the grasslands of East Africa, in the place where human beings originated, under the night sky, the most distant galaxy tells the origin of the universe. In fact, there is no darkness in the earth, but the light from other stars is too far away from us, and we can only see it when the sun temporarily withdraws. Always love the universe, if we lose interest in how the universe works, what's the point of life? I. Destiny's 13.7 billion-year history spans countless stars and galaxies, and this universe is filled with wonders beyond our imagination, each of which is relevant to us. The impact of time on the earth can be seen everywhere, and eventually he will lead the earth to its demise, but without time, the world as we know it would not exist at all, if the world we live in is completely static, there will be nothing yesterday and today. difference. The arrow of time pushes all things to change in one direction, and all things must do the same, otherwise the world can move forward, and it can completely go back to the past, in which case the world will be static. The arrow of time turns today into tomorrow, which means nothing stays the same. The arrow of time drives the evolution of the universe, which is not stuck in an endless cycle, but is moving irreversibly into the future. Decay is a common sight in the universe, and everything tends to gradually become disordered, not permanent. The arrow of time determines that all things will eventually be disordered, broken, and returned to dust. As time advances, everything will gradually become disordered, which also gives time a definite direction, distinguishing the past from the future. The past is relatively orderly, while the future will inevitably become disordered. Disorder must become increasingly apparent, so the past must be different from the future, thus forming the arrow of time. Decay and destruction are inevitable consequences of the passage of time, as is the fate of all things in the universe. Day after day, moment by moment, everything in the world is slowly heading for disorderly destruction and decay. Nothing can escape time, and it advances relentlessly, even the stars are impossible. The fate of the sun is also the fate of all stars, and one day they will all perish and the universe will forever be plunged into eternal darkness. , is the final point of the arrow of time. Because the ordered universe we live in, and all the wonders in the universe, cannot last forever. We have seen how the magnificent age of perseverance began and how it will end. The matter that makes up the black dwarf, that is, the last matter in the universe, will eventually disappear, turning into radiation and entering the void universe, leaving no trace. After the darkness disappears, not even a single atom will remain, and only light particles and black holes will remain in our once prosperous universe. After an unimaginably long time, the black hole will also disappear. The only remaining perseverance is the last bit of matter, and this matter will disappear completely. At this time, the story of the universe will finally come to an end, and for the first time in the entire history of the universe, the universe will remain unchanged for the first time. It can no longer continue in the direction of disorder because it no longer contains any decaying matter. The past, present and future will no longer be different, and the arrow of time will disappear completely. lose. Nothing will happen, and will never happen, never will. The arrow of time points to a barren and bleak future, but if this process can be reversed, if we can stop the universe from dying, there must be a part of the universe missing - life. The arrow of time invisibly points to destruction, but recession adds beauty and wonder to the universe and gives us a chance to survive. The same sun rises and sets every day, seemingly eternal, but in fact constantly dying, but in the process the sun is releasing light and heat, it is sunlight that sustains life on earth, assuming there is no sun or the sun does not It will die out, the earth will not be what it is now, there will be no planet like the earth, and there will be no life. It was the arrow of time that led to the first formation of life. Because stars and planets take time to form, it takes time for particles of matter to assemble and form life. When marching towards a barren and empty future, the arrow of time opens a window, providing a chance for life to multiply, but this window is only open for a short time, and life exists for a negligible time, from the birth of the universe to the last The black hole disappears, and life as we know it is only one trillionth of the lifespan of the universe. The existence of life in the universe, or life composed of carbon elements like me, can only exist for a very short moment in the long river of time. Although the existence of life is infinitely short, it is not insignificant, because in this short period of time, life has evolved from a single cell to a complex human complex to be able to understand the true meaning of time. 2,500 years ago, humans built stone towers on top of the mountain to measure the passage of time. Today we build devices that can see through time and space, almost always seeing the beginning of time. We sit here and look at the universe from a tiny earth. In just a few decades, we have delineated many structures in the universe. Now we have a general understanding of all the stars and galaxies, from the beginning of the universe to the present. , which I think is remarkable. We are part of the universe, as are planets, stars and galaxies. But as a part of the universe, we can observe the universe beyond our field of vision and think about the place of human beings in the universe. Humanity is the momentary light in the long darkness of the universe. This time of our existence is by no means insignificant, it is the most precious moment. II. Every atom in our bodies is the result of a cosmic cycle that begins not here, not on Earth, but in the depths of space, throughout the epic life cycle of a star. To understand how the stars become we first need to know that everything goes through the cosmic cycle of life and death, which can be clearly seen on Earth. After the creature dies, it sinks to the bottom of the sea and gradually compacts, forming a rock. The endless cycle of resources on the earth has not stopped since the beginning of the world, and it has not stopped until today. The rocks and mountains around us are all composed of living organisms. Their substances are composed of the same as ours. material production, everything is a reciprocating cycle, from life to rock, and back to life. Rocks on Earth can become living things, and living things can become rock back in part because everything is made of the same thing. The composition of this earth, including me and the plants around me, is exactly the same as the entire universe, and we are closely connected to the universe because we all have the same composition of matter as planets and galaxies. Our source is hidden among the stars, and every atom in our body was created in the depths of space, but the story of the creation of the universe is not over, because when we look into the depths of the universe, we see more than individual elements, We can also bear witness to the sources of life that may make us. All the basic parts you need to build all the building blocks of life are present in this space stone, which leads to an interesting speculation that some of the molecules needed for life in the first place may have formed in the depths of space , and then sent to the earth by a meteor. We are born directly from the various changes in the life and death of stars, and every atom and molecule in our body records the entire history of the universe, from the Big Bang to today. After all, we are part of the universe, so the story of the universe is our story. Ⅲ. The so-called gravitational force is the force that attracts objects to each other. How much gravitational force an object can generate depends on the mass of the object itself. For a small stone, this force is insignificant. In the case of our huge planet, gravity is powerful enough to change the face of the entire Earth's surface. Gravity is the glue that binds our solar system's countless other planetary systems together to form the most beautiful and varied wonders in the universe—galaxies. Space is not empty, but has a "space-time" structure that can be distorted by the massive masses of stars and galaxies. All objects with mass can distort space-time, and the greater the mass, the more significant the distortion of space-time. Everything in the universe moves in a straight line and travels in this twisted structure, that is, the twisted space-time of the universe. The orbits of planets we see are actually just planets falling into space-time distorted by massive stars. Everything in the universe is falling, the moon is falling into the canyon created by the mass of the earth, the earth is falling into the canyon created by the sun, and the solar system is falling into the space-time canyon created by the Milky Way. Gravity is the great creator and the force that builds the world. Only this force in the universe can cover the vast interstellar space and bring all kinds of matter together to create planets, moons, stars and galaxies. However, gravity is also a destroyer, because it is cruel and ruthless. Whether it is the most massive celestial body or a huge star, gravity will crush all matter and eventually form a black hole. It is this duality of gravity that works wonders in the universe. Gravity contains the true wonder of the universe. IV. Messenger Our other senses, hearing, touch, taste, and smell, are all limited by distance, but light makes our vision incredibly powerful. Light waves are different. They can transcend all distances, travel through the cosmic vacuum without any hindrance, and then come to us from tens of billions of kilometers away, extending our sight to the deepest part of the universe. I don't see the world at this moment at all, we are always looking to the past. The light we see now from Andromeda is from 2.5 million years ago, when our ancestors first set foot on this land of East Africa. It is incredible that the time scale and distance scale of the universe are very huge. In contrast, human civilization is just a flick of a finger. Using a telescope to observe the pre-human moments gives us the ability to travel through time. Some galaxies collided while life on Earth was still nurturing in the oceans. Our universe is astonishingly large, and it makes people feel so tiny. It is unimaginable that it was not the Big Bang that occurred in space, but that the Big Bang created space, and then space continued to expand in all directions, and galaxies are still flying apart today. Light meets human beings and not only gives us eyes to appreciate the wonders of the universe, but also helps us understand the universe. With light, we have seen with our own eyes the birth of new stars in distant stars, the edges of the universe, galaxies lost in time, and the universe in its infancy. With light, we can tell the story of the universe.
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