The first episode of Arrow of Time. There is only one flow of time that we can experience, from order to disorder, from past to future, and the universe will eventually be dead. The 13 forts built by Peruvians 2,500 years ago turned out to be used to mark the position of the rising sun to mark the date. We think that the earth is unchanged and the moon is unchanged. In fact, due to the action of tides, the rotation speed of the earth will decrease. A day on the earth today is 15-16 minutes away from a day on the earth 65 million years ago. Due to the influence of the earth, the moon is moving away from the earth at a rate of 4 centimeters per year. The sun has entered its prime and will run out of fuel in five billion years. In 2009, scientists discovered the oldest star ever, emitting powerful gamma rays before dying. These rays took 13 billion years to reach Earth, which is the age of the star that died early. Time is the most powerful weapon, human beings are tiny fragments in a long history, but it does not prove that we are not important, we have developed from single-celled organisms to high-level human beings, and can understand the time and origin of the universe, human beings are indeed great what. I think it’s really not important. If you understand or not, the universe doesn’t need you to understand. Human beings just like to find meaning for themselves. It suddenly occurred to me that if alien civilizations discovered a signal on the earth, they would also see the earth many years ago, this huge time difference. It was pretty cool, I liked the second episode. life and death, In the cycle of life and death, Indians have mastered the essence. Death is nothing but a change of clothes. Of the 92 elements in the universe, the most basic one is hydrogen, which has only one atom. The difference between various elements is the number of atoms. The crew was quite funny. They went to the desert to blow bubbles and explained that you guys are going to the desert to travel by the way. Fired metals show different colors on the spot. You can judge the composition of elements on the planet only by analyzing the light of the stars. It suddenly occurred to me that the ancient alchemists could make the fire show different colors by adding metals. When the star's fuel runs out and dies, its own weight causes it to collapse inward, and the temperature rises. Every time the temperature reaches a level, new substances will be formed until iron is formed. The remains of the entire planet are solid, layer by layer. substance. When the core becomes iron, will there be no way to continue to release energy outwards, and then there will be an explosion, so that the matter will be released. This form can form 26 elements. The rest of the elements, including gold, are formed when a supernova explodes. The explosion can generate a high temperature of 100 billion degrees for 15 seconds. Heavy metals are formed in this process and spread in the In the nebula after the explosion, it becomes the material for forming new planets. Every 100 years, every galaxy will explode with a supernova. Scientists predict that Betelgeuse may be coming soon, and they want to watch the live broadcast. I don't like Brain, the astronomer who is praised by many people. I like him because I haven't seen others. He is much more than his lovely scientist in the universe, and this person is a little bit inarticulate. Qing, I like clear pronunciation. Gravity, the zero-gravity plane experience at the beginning is fun, the photographer is very strong, and can keep up. The attraction of the moon to the earth has caused the phenomenon of copying on the earth, and in turn the earth has a strong attraction to the moon. There is no water on the moon, and it is rocks that are moved. The rock waves are several meters high, and the friction generated by the movement slows down the moon. The autobiography eventually formed the pattern it is today. Spiral galaxies are normal, elliptical galaxies are irregular and are what they look like after galaxy mergers. The gravity of 8G is basically the limit, the blood will flow to the legs, the lack of oxygen will lead to loss of vision. The Chaco civilization observed supernova explosions for three weeks in a row, and they could see it during the day, and they painted the event on the rocks. The neutron star's autobiography frequency is 30 revolutions per second, and it also emits an intense beam of light. The mass equivalent to the size of the sun is compressed into a size of about 20 kilometers. If you take a spoonful of neutron stars and throw them on the earth, the mass is so large that it will directly penetrate the earth. This material will become a super weapon, but this mass Can't stand it. Einstein creatively proposed that space is not empty, space-time is a structure, and massive objects will Twisting the fabric of space-time, all the stars actually fall in canyons created by greater mass. It also predicted the existence of black holes in spacetime, which are supermassive objects. It turned out that the black hole is at the center of the Milky Way, with a mass equivalent to 4 million suns. The protagonist of this episode is Light. Earlier, we used ocean waves as an example, saying that waves are full of energy. I thought I wanted to talk about the wave-particle duality of light, but I didn't. It is possible to break through the speed of sound, but it is impossible to reach the speed of light. A light-year is both a unit of distance and a unit of time, and the objects we see are objects in the past, both in front of our eyes and in time for our eyes to see. The Andromeda light we see now was emitted 2.5 million years ago, when the first footprints of Homo sapiens appeared on the African continent. The existence of the universe is 13 billion years, but due to the expansion of the universe, the size is currently 93 billion years old, and there are some celestial bodies that we will never see. In other words, this crew really likes to let the scientists who appear on the scene go to the actual inspection, often on the top of the mountain, the seaside, the desert, and travel by the way, and it can also stimulate the interest of the audience to go to the scene, which is very good.
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