How important is light? The Chinese Sky Eye cannot do without it for almost 24 hours, revealing the mysteries of the universe

The picture shows the sunlight

Humans are very familiar with light, because the earth receives light from the sun every day, and the light that humans can see. This part of light is called visible light. In fact, there is still light in the universe. There is a lot of light that is invisible to human beings. This part of light is called invisible light. So how important is light? From Hubble Space Telescope to Chinese Sky Eye, especially Chinese Sky Eye disappears almost 24 hours without it. Although the principles of these two telescopes are different, they are both important means for humans to explore space. Then humans explore the universe. What does it depend on? Yes, it is precisely because of the light that the mysteries of the universe can be revealed. Next, let's see what the experts say.

The picture shows sunlight

Light is actually a very complex substance, and its essence belongs to a photon flow of a specific frequency band. Light must have a light source to emit light, and the propagation speed of light is very high. Fast, close to 300,000 kilometers per second in a vacuum, so the light from the sun to the earth is actually not real-time, but it was emitted from the sun 8 minutes and 20 seconds ago. The reason why humans can see objects depends entirely on The reflection of light, objects of different colors will reflect different light, and black objects will absorb light, so it can bring visual differences to people.

The picture shows the spectrogram

As early as hundreds of years ago, the famous British scientist Newton had studied light. Through the lens, he found that the sunlight is actually composed of 7 colors. Rain The rainbow that appeared later was actually the phenomenon of light refraction. Later, on the basis of Newton, Huxel discovered infrared , and then human scientists discovered ultraviolet light, so a spectrum map was gradually perfected in the hands of scientists. Let humans know that it turns out that light is not only color, but also frequency and wavelength.

whether it is visible or invisible light,Unity can be called electromagnetic waves. The invisible light of humans does not mean that these lights have no effect on humans. On the contrary, these lights are also playing a very active role. For example, infrared rays can be used by humans based on infrared principles. Measure temperature. In addition to infrared rays, there are ultraviolet rays in sunlight. Although ultraviolet rays are harmful to the human body, they are protected by the ozone layer, which can effectively reduce the damage of ultraviolet rays. When ultraviolet rays are irradiated on the earth, they can play a sterilization effect. Based on this principle, mankind has developed an ultraviolet lamp.

The picture shows the application of X-rays in medicine

Light has another important purpose, that is, it can realize human long-distance communication. The light that enables human communication is called microwave, such as mobile phones and radios. Communication is achieved through microwaves, and space is also full of various radio waves, especially when sunspots are active, they can even affect short-wave communications on the earth. In addition to these lights, there are actually some very dangerous lights. They are called rays, such as gamma rays, X-rays, etc. They are light with extremely high frequency, extremely short wavelength, and extremely strong energy, which can penetrate the human body. If exposed for a long time, it may even cause human health problems. In medicine, these two kinds of light can play a very crucial role.

Humans are currently exploring space, especially hoping to use radio telescopes to explore whether there is a civilization in the universe that is the same as that on Earth. Therefore, the radio telescopes built by China can receive specific electromagnetic waves from space, once they capture special radio waves , And then decipher, maybe human beings can realize time communication with alien civilization, so this step is still inseparable from the role of light.