Witness the king of constellations, the brightest star in the night sky.

Our night sky is like a huge curtain of a ball screen movie, and those stars are projected on the curtain of the night sky. In our opinion, the brightness of these stars is different, which is mainly determined by two factors. First, the farther a star is from the earth, the darker it looks; The second is the light intensity of the star itself. The stronger the light intensity, the brighter it looks.

1. King of constellations, Orion

Orion is the brightest constellation, so it stands out in the night sky. Besides bright stars, Orion also has the famous Orion Nebula (M42).

First, let's look at the time when Orion appeared. It's 65438+1mid-October. After sunset, it has appeared in the southeast sky. At about nine o'clock in the evening, it will move due south of the sky. The main part of Orion consists of seven bright stars.

Secondly, let's learn about the shape of Orion. Of the seven stars that make up the main body of Orion, three are arranged obliquely in a straight line. We can find these three stars first. These three stars are Betelgeuse, Betelgeuse and Akisaka from the bottom left. These three stars are also called Fu Lushou Samsung. The proverb "Three stars shine high" refers to these three stars.

Sirius, the brightest star in the night sky.

Sirius is actually a binary star system. The mass of the larger star Sirius A is about 1.7 times that of the sun, and its brightness is 25.4 times brighter than that of the sun, and its light is blue. It is an early type A blue dwarf, about 8 light years away from the Earth. For a long time, people thought that Sirius was a star, and because of its extremely high brightness, it was usually regarded as an important "starry lighthouse" to guide the direction.

According to the progress of astronomical science and technology and the improvement of observation technology, astronomers found that Sirius also has a companion star-Sirius B, which is much darker than the main star and very close to the main star. It is located at the lower left of Sirius, and its density and temperature are much higher than Sirius A. Sirius B is a white dwarf with the characteristics of low luminosity, high density and high temperature. Sirius B is one of the largest known white dwarfs.

Sirius is the brightest star in the night sky and can be observed almost anywhere on the earth. Except in the area north of 73 N, of course, in the high latitudes of the northern hemisphere, Sirius will not rise very high and may be blocked by things on the surface.