# Albert Einstein

Why is the night sky black? You may think this question is boring: because there is no sun! But in fact, the problem is not simple or boring at all. Many times we are accustomed to the things around us, and often do not think deeply. Let me talk about a p

Since birth, human beings have longed for the vast space and wanted to see the outside world. In recent decades, as scientists continue to increase the exploration of outer space, people are more eager for the world beyond the earth. However, the universe

For a century, astronomers have explored an ever-increasing extent of the universe. Less than a hundred years ago, people thought that the Milky Way was our entire universe, but now we know that the universe contains hundreds of billions of galaxies like

When people infinitely approach the speed of light, one touch can be realized, but the speed of human movement cannot reach the speed of light. Since the appearance of Einstein's "Special Theory of Relativity", human beings have a new understanding of tim

The direct answer is: the universe we live in is limited! Because the universe is limited, it is destined not to accommodate infinite things. No matter what attributes in the universe, it is impossible to be infinite, including density, volume, speed, qua

How big is the universe? Is there an end? We don't know yet, and probably never will. But we can try to analyze and imagine. Black holes, weird celestial bodies that everyone has heard of. A black hole has an event horizon. What is the event horizon? In l

Einstein is not only a name, but also a synonym for wisdom. Ten years after Einstein proposed the special theory of relativity, he proposed the general theory of relativity, which explained the nature of gravity with the curvature of space-time. The theor

Black holes are synonymous with "horror" in the eyes of many people, because black holes can devour all objects that come close. Once any object crosses the event horizon of a black hole, it will never return and will be completely swallowed by the black

Wormholes, I believe everyone has heard of them, are also called "Einstein-Rosen bridges". Simply put, they are shortcuts connecting two distant time and space. space. A wormhole is like drilling a hole in an apple and hitting another point directly inste

Simply answer: the so-called "up and down" in our daily life does not exist in space. Even if the planet wants to fall, where will it fall? In addition, the so-called levitation of the planet is just an illusion of ours. In fact, the planet is not really

Those who understand quantum mechanics must have heard of a famous experiment: electron double-slit interference experiment. The predecessor of this experiment was to replace electrons with photons, but it was very inconvenient for scientists to observe w

This c is fundamentally derived from the definition of four-dimensional velocity and four-dimensional momentum. Let’s ignore the four-dimensional momentum. Let’s explain it in other tricky ways:From dimensional analysis ExplanationThis explanation is th

Simply speaking, because one of the most basic principles of the theory of relativity is that the speed of light is the speed limit of any movement, which cannot be exceeded, and once the movement faster than the speed of light is allowed, then the theory

Students who have studied college physics know that special relativity has a foundation, that is, the principle of special relativity, that is to say, the motion of an object is relative, which depends on the selection of the reference object. One point i

Let's start with the answer: No. No matter how fast the speed is, it cannot reach the boundary of the universe. Because, no matter how we fly, it is impossible for us to fly "along one direction". According to Einstein's general theory of relativity, the

The constant speed of light has great significance for the universe itself, let us start with a simple example. We've all been on a train, how fast can it go? Let's say it's 300 km/h. But if you change the observation point, you will have a different answ

Einstein's special theory of relativity and general theory of relativity have been published for more than 100 years. After the baptism of centuries of ups and downs, this theory has been polished more and more brilliant, and has become the cornerstone of

Humans live on the earth, we can't feel the earth's movement at all, but in fact, the earth not only rotates itself, but also revolves around the sun. Looking at the vast universe again, in fact no object is static, which is also One of Einstein's rare mi

We live in the material world, and we can see different materials every day when we open our eyes, such as tall buildings, cars, trees, the sun in the sky, clouds and so on. But when we use a microscope to explore the mysteries of the microcosm, we will h

Throw the ball at the wall, it will bounce and you can catch it again. So far so good. The ball doesn't suddenly disappear from the wall or turn into something else. This perfectly normal, predictable behavior that you just saw is classical physics at pla