However, the ability of the naked eye is limited. If you really want to observe the starry sky, you need to use a more powerful tool-astronomical telescope. 1608, Galileo made a telescope with a diameter of 4.2 cm and a length of about 1.2 m. He used a plano-convex lens as the objective lens and a concave lens as the eyepiece. This optical system is called galileo telescope. Galileo aimed his telescope at the sky and made a series of important discoveries. Astronomy has entered the era of telescopes.
16 1 1 year, German astronomer Kepler used two biconvex lenses as the objective lens and eyepiece respectively, which significantly improved the magnification. Later, people called this optical system Kepler telescope. These two forms still use refractive telescopes, and astronomical telescopes are Kepler-style. It is with the emergence of astronomical telescopes that we can learn more about the distant stars in the universe and explore the mysteries of the universe before interstellar travel is realized.
Second, the invention of the telephone, communication is always the most important way for human beings to communicate with each other. In ancient times, people sent messages by carrier pigeons and messengers. After entering the era of science and technology, there will naturally be new ways of communication, and the emergence of the telephone is a major breakthrough. 1876, Alexander Graham Bell became famous for inventing the telephone after applying for a patent. But in 2002, the US Congress announced that the real inventor of the telephone was poor Italian inventor antonio meucci.
The appearance of telephone has completely changed the way of human communication, and the distance between people is getting shorter and shorter. We can communicate with people far away by telephone. Nowadays, the communication mode has entered the wireless era, and the mobile phone has become an indispensable tool in people's daily life. Mobile phone is an upgraded version of telephone, which is no longer limited to communication. Its functions are getting richer and richer.
Third, the invention of radio, if the telephone revolutionized wired communication, then the wireless transmission of information through the air shocked the world. Galileo Marconi won the Nobel Prize for his first successful long-distance radio transmission. However, in doing so, he infringed several patents of the inventor nikola tesla.
It is with the help of computers that human science and technology can develop rapidly in the future. Computer's data calculation and processing ability is much stronger than that of human brain. Take the calculation of pi as an example. For thousands of years, countless mathematicians have counted digits by hand. However, with the advent of computers, this number has been continuously improved, and now pi has reached 3 1.4 trillion bits. If it is calculated manually, it may not be completed in ten thousand years.
It can be seen that the data processing energy of computer is extremely powerful, and the future computer is developing in the direction of artificial intelligence, and its ability is no longer limited to data processing. In the future, powerful artificial intelligence will play an important role in all walks of life and help human civilization take off again.
Six, the emergence of the Internet, with communications, with computers, if there is no network, then everything is useless. The appearance of the Internet has brought the world closer and made communication and computers more useful. After decades of development, the Internet has penetrated into all aspects of human society and every family.
Imagine what kind of scene it would be if the world suddenly lost the Internet. I believe that many aspects will stagnate, and human beings cannot live without the Internet. It has been integrated into all aspects of people's lives and into all aspects of human science and technology. Without the internet, cars can't navigate and dare not go out, planes can't fly, rockets can't go into the sky, and so on.
Seven, the invention of laser, I believe that everyone is no stranger to light, we are dealing with it every day, and we also know that the speed of light is the fastest, reaching 300,000 kilometers per second. Every day the sun shines on the earth, bringing light and warmth to the earth and bringing vitality to life. It can be said that only with light can we create the world, the life of the earth and the birth and development of mankind.
Under normal circumstances, our bodies are shuttled back and forth by light every day, but we can't feel the harm of light to us, because the quality of light is almost zero, and they are too scattered to penetrate people's bodies and will not cause any influence or harm. But what happens when a large amount of light gathers and then shines on an object?