The brightest constellation in the smog _ What color is the most serious smog?

What kind of air pollution is the reason why Polaris doesn't shine?

Polaris is not the brightest constellation.

Polaris is very close to the sky referred to by the North Pole of the Earth. It always seems to be in the northern sky and is famous for its geographical importance. In fact, according to the brightness, it is just an ordinary second-class star, belonging to the "younger generation." It is 300 light years away, and Polaris belongs to the brightest star in Ursa minor.

Usually, people think that Polaris, which is used to guide the direction, should be a bright and easy-to-find star, but in fact Polaris is used to guide the direction not because it is bright or not, but because it has been located near the North Pole and its position is relatively stable.