The Ten Gods of the Demon Moon had now come to the Orion Dark Nebula to witness the birth of a star, and now, in front of the Demon Giants was a blood-red world, and the dust and gas were attracted by the spinning ball of light and began to spin.

"Now, its internal temperature has reached several million degrees, so that it can maintain the sparkle of the sun, produce light and heat and energy, which is enough to maintain the growth of ordinary creatures, and your Nine Star Fire Gate can also exceed this temperature, so, the love fire can not only destroy miè, but also create zào, understand?"

"Yes, I see. ”

Love fire, from the time of comprehension, from the inside to the outside of the love xù intensified, embodied into a magical flame, this is a kind of mystery, a kind of great divine law, the temperature alone has tens of thousands of degrees, and open a fire door, almost can break through a million degrees, such a high temperature can make a lot of substances annihilated, of course, control zhì to the extreme, this is what needs to be done.

"You've seen so much and you've seen what gravity is, now let's talk about its history. ”

Honglian took over the topic and began a new round of commentary: "For the exploration of the universe and the unification of the theory of all things in the universe, the predecessors of our earth are still very admirable, although they have not cultivated, but the spirit is extremely powerful, they have always longed to have a set of theories to summarize all things in the universe, hoping to be able to simplify the complex. ”

"First of all, let's start with gravity, which is a famous story in the history of the earth's calendar science, one day in 1655, a young man was sitting under an apple tree, and every one was so sudden. He saw an apple fall from a tree. With the drop of the apple, this scientist named Isaac Newton described a new picture of the universe. In a bold conjecture of his time, Newton claimed the force that pulled the apple to the ground. It is practically the same force that makes the Moon revolve around the Earth. ”

It was this theory that Newton suddenly unified the universe and the mortal world, one is a vast planet and the other is a simple apple, and then he named this force "gravity". This law unites the heavens and the earth, from the stars in the sky to the ebb and flow of the tide, or even the fall of a simple apple. This is the first time in the history of the earth that a unified theory of the natural world has been made. This is also applied to everything in the universe, and it is called gravitation. ”

While watching the slow changes of the star next to him, he smoked a cigarette, took a few puffs beautifully, and the red lotus moistened his throat, and then began to understand: "Gravity is the first force to be understood in the history of earth science, and in the end, three other forces have been discovered, which are also the four basic forces of the universe that Elandi said before. This law of Newton is widely used by mankind. Whether it's a rocket lift-off or a moon landing, it's just his simple formula. However, there is a problem here. Although the law of gravity describes the strength of gravity very accurately, Newton had an embarrassing secret. He had no clue how gravity worked. ”

But those scientists, who had been contented with using the law of gravity for more than two hundred years, avoided mentioning the question that Newton was obsessed with. Until years later. It took an obscure little clerk in a patent office to change this qiē. The scientist, Albert Einstein, worked hard to consult the relevant patents while pondering the properties of light. He never expected him to think about light. It led him to solve Newton's puzzle -- what is gravity?

When he was twenty-six years old, he made an astonishing discovery, it turned out that the speed of light is the speed limit of the universe, and no speed in the universe can exceed it, but when he published this theory to the world, he found that his theory contradicted Newton, the father of gravity. ”

"Wow, husband, you earthlings are so amazing!"

"Yes, let's go to your hometown when we have a chance in the future, and see how those earthlings are so smart?"

"Ahem, that, it's a must, and don't look at who I am. ”

"Okay, don't be complacent, go on, what contradiction do they have?"

Retracting her thoughts, Honglian continued to explain: "The problem lies in the theory that no speed can exceed the speed of light is contradictory to gravitation, in order to understand this contradiction, let's assume that we have also seen the eight planets of the solar system before, and everyone is familiar with the sun, right?"

How can it be unfamiliar? The sun's attitude of life, which burns all its life, is like the goal of the demons, and besides, Red Lotus and Xiaolan are still doing a bad thing on it, besides, isn't there a star next to it that is evolving? Maybe in tens of millions of years, it will be a sun.

Seeing that the faces of her beloved wives became a little gloomy, Honglian smiled awkwardly, and then changed the topic: "First of all, let's assume a cosmic catastrophe, suppose that the sun disappeared one day, and disappeared so suddenly. What happens according to the theory of gravitation? Newton's law predicted that if the sun were destroyed, the planets would immediately break out of their orbit and fly obliquely into space. In other words, Newton believed that gravity acted instantaneously beyond any distance, so people on Earth could immediately feel the effect of the sun's disappearance. ”

While explaining, Red Lotus is a model of the movement of the "sun" created by the divine power of the fire system and the eight planets of the solar system in coordination with words. However, Einstein discovered the problem of Zài in Newton's theory, and his study of light made him know that light does not travel instantaneously. As we said earlier, it takes about eight minutes for sunlight to travel to Earth, which is 93 million kilometers away, and he proved that no thing, including gravity, can exceed the speed of light. Then why did the Earth get out of its orbit before it was plunged into darkness by the sun's disappearance?"

For Albert Einstein, who was still a young man in the patent office at the time, nothing faster than light could exist, which meant that Newton's theory of gravity, which had been used for more than 200 years, was wrong. Suppose that if Newton was wrong, then how did the planets next to us abide by their duties? Newton's theory triumphed on the basis of the urgent need for the study of celestial bodies in the scientific community at that time, especially the question of how the planets orbited, and according to Newton's formula, the movement mode and trajectory of the planets could be calculated. For the position of the two at that time, if they wanted to prove the mistakes of their predecessors, then Einstein had to solve the dilemma at hand. ”

"He had to paint a new picture of the universe, where gravity could not exceed the speed of light. While working overtime day and night, Einstein was lonely on this road. After nearly ten years of racking his brains, he got the answer in a new unified way, and he began to think about a new mode of three-dimensional space, one-dimensional time, "space-time". He hoped that by understanding the geometry of this four-dimensional space-time, he would be able to simply translate things along the surface of this space-time structure, a unified structure that could be bent or extended by massive objects such as planets. And it is these distortions and arcs of space-time that create the gravitational pull that people feel. ”

"The motion of an Earth-like planet in its orbit is not due to the continuous gravitational pull of the Sun to grasp it, as Newton's theory suggests, but simply because it moves with the curve of the structure of space created by the Sun. ”

Speaking of which, the red lotus flew with both hands, and the sun and the eight planets reappeared, and they were now on a virtual net-like space. With a slight smile, Red Lotus spoke: "Okay, let's go back to the previous assumption now, and now let's see what will happen if the sun disappears." Gravitational disturbances will cause a wave that extends along the structure of space, just like a small pebble thrown on the surface of a calm lake, and the ripples it causes ripple on the surface of the water, so that the earthlings in orbit will not feel any change until the wave reaches the earth. In addition, Einstein calculated that this gravitational wave travels precisely at the speed of light. So, using this new method, Einstein solved the contradiction with Newton about the speed of gravitational propagation. ”

After watching the "sun" in the middle disappear, the curves and arcs called space-time continue to ripple, and the "earth" only left its orbit after a period of time. Immediately, his hands continued to slide again.

More importantly, Einstein illustrated the nature of gravity by depicting a new world, a curved and curved structure of time and space. You see, that's it. He called this new depiction of gravity the general theory of relativity. Within a few short years, Albert Einstein became a household name. At that time, Einstein was like a superstar, alive and well-known, and his status was like the Tianfa Merlin of the Sky Continent at that time, and he was the creator of an era. ”

"People follow his work and are full of expectations, because his research on general relativity is so brilliant that he rewrites the theory of gravity, and people hope that he will continue to work hard and see this happen. Despite his success, Einstein was not satisfied, and immediately set his sights on something even greater, unifying his new discovery of gravity with the only other known effect of the time: electromagnetism. ”

Immediately, there was an extra lightning bolt in Honglian's hand, and he continued to explain: "In the decades before this, the electromagnetic force had just been unified, and at that time, when electricity and magnetism had not yet been unified, it aroused the research interest of countless scientists, and these two forces were mysteriously linked. (To be continued......)