science

I read, "Is space in the dark?" ", where does PM2.5 come from."

Is space in the dark? Mainly: There are countless stars in the universe, these stars will heat up, and the temperature on the surface and nearby will increase. But the universe is also an infinite space. The temperature of the space is much lower than the temperature of the surface of the star. Therefore, the space is dark in people's eyes. If people look at the universe in space, they must be very different from what they see on Earth. In the space, because there is no influence of the atmosphere, the color displayed by the stars is no longer a single white seen on the earth, but a variety of colors such as yellow, red, blue and white. At the same time, because there is no atmospheric refraction, the stars will not look flashing any more. At this time, the universe is like a black background, and the stars in the sky are like a colorful gemstone set on a black background.

Where does PM2.5 come from? Mainly: PM2. 5 is a dangerous thing.

PM2.5 has a wide range of sources and complex causes, mainly due to emissions from human activities. Including coal burning, burning oranges, barbecue, burning garbage, motor vehicle trips, construction dust, etc., will contribute to the increase of PM2. 5, some of the emitted gases will also produce PM2. The smoke generated when smoking is PM2. 5 Natural sources include: wind dust, volcanic ash, forest fires, pollen, bacteria and so on.

Taking Beijing, China as an example, about 60% of PM2.5 is derived from combustion processes such as coal burning and industrial use of coal, 23% from dust, and 17% from solvent use and others.

We must protect the environment and love science.

Sixth grade of Caobao Guoxiao, Jiangyan City, Jiangsu Province, China: Zhang Sumin