The photographer collected the most beautiful starry sky on the southeast coast of the UK. Why is it so difficult to see the starry sky in the city?

Because the lights in the city are too bright and the pollution in the city is relatively large.

Nowadays, more and more artificial light sources are widely used, especially in big cities. Various lights illuminate the night sky, which is what we call light pollution. The newly ignited artificial moon will light up the entire Chengdu in 2020! But it extinguished mankind's dream of looking up at the stars, and the Industrial Revolution as we know it did bring unprecedented significant progress in technology, civilization, productivity, etc., along with it came air pollution, smog, Changes in the PH2.5 standard in recent years! The turbid air scatters the light that originally shot directly into the air to lower places, reducing the visibility of night vision observations to a greater extent.

The biggest enemy of perceiving the starry sky is all kinds of extra light. Just like the sun's rays during the day make the stars invisible, and the artificial light at night makes the stars dim, only the brightest ones can be seen. Just stars. The Milky Way was originally a dim band of light in the sky. It only revealed its brilliance and splendor in a dark environment. In the face of huge future projects such as artificial city lights and even artificial moons and artificial suns, they were overwhelmed by the former's light. Fade into fluorescence!

Some people used to ask children how many stars there are in the sky, but now it is estimated that every child can count them clearly, there are only a few! There used to be countless stars in the sky, but now there are countless lights on the ground. According to statistics, at least 2/3 of the people in the world cannot see the Milky Way. For poor city dwellers, the Milky Way has long become a legend. Today, only the screens of planetariums can allow city dwellers to return to nature, experience the glorious civilization of the Milky Way, and experience the Big Dipper, the Cowherd and the Weaver Girl, and thousands of constellations.

In the Milky Way in winter, there is the Milky Way on summer nights. If we leave the city to look for the Milky Way, will the Milky Way in winter be different from the Milky Way in summer? On Earth (the Galactic Center), which is about 30,000 light-years away from the center of the galaxy, we see different images of the Milky Way in different seasons. The Galactic Heart is located in Sagittarius, a summer constellation, so the Milky Way is brighter in the summer. On the contrary, the Milky Way we see in winter looks dimmer. What’s interesting is that there are so many stars in winter, which can be regarded as an extra benefit given by nature to stargazers in winter.

But those are just false after all. There is no comparison between cars and car toys, not to mention that the entire earth is just a drop in the ocean in the Milky Way, let alone unnatural celestial bodies created by the entire country's manpower, material and financial resources, but technology Progress is bound to hope that humans can solve complex problems more reasonably when exploring the future!