What is the secret of Sirius? Why is there a legend of Sirius all over the world?

Among the stars in the sky, Sirius is quite famous. It is the brightest star in the night sky. It will always be next to Orion, and the position of Alpha Canis in Canis will not change, even if it is moving, our eyes can't see it.

Sirius is not an auspicious symbol in China, because it represents the star of war and disaster. Named after Sirius also shows our view of it. There is a saying in The Songs of Chu Nine Songs Dong Jun: "Yun Lan is dressed in white, and the long-term goal is to shoot Sirius." There is also a story in "Jiangchengzi Mizhou Hunting", "I will bow like a full moon, look at the northwest and shoot Sirius."

For example, the ancient Egyptians observed the running law of Sirius, which was closely related to the flooding degree of the Nile. After they confirmed this fact, they regarded Sirius as a god, while China people in ancient costume regarded Sirius as a "sign of the main aggression" according to the observed phenomenon. So it can be said that the mystery of Sirius actually comes from human imagination, and it is too bright in itself.

1. Sirius's radiation is too strong, and its luminosity is 32 times that of the earth. So simply calculate that the planet must be outside 4. 174 astronomical units to get the horizon illumination. Of course, regardless of its ultra-strong ultraviolet rays, there are violent coronal mass ejections!

2. The radiation of white dwarfs in binary system is too strong.

3. Binary stars may rob planets, and of course they may have stable planetary orbits, but they are closer to the main star or companion star.

Generally speaking, when I say Sirius, I mean Sirius A, which is a blue dwarf star with twice the mass of the sun, about 1.7 times the radius of the sun and about 8.6 light years away from the earth.

It is worth noting that Sirius's brightness is very high. Relevant data show that Sirius's visual magnitude is-1.46, and its brightness is as high as 25.4 times that of the sun. It is the brightest celestial body in the night sky except the moon, Venus and Jupiter.

As the brightest star in the night sky, Sirius has naturally become one of the most concerned objects, so there are legends of Sirius all over the world.