What is the Nine-Day Galaxy?

Nine-day Milky Way refers to the milky white bright belt across the starry sky. In ancient China, it was also called Tianhe, Han Yin, Xinghe, Xinghan and Han Yun.

The Milky Way has different shades and widths in the sky. The narrowest is only 4 ~ 5, and the widest is about 30. After Galileo invented the astronomical telescope, with this mystery, he aimed the telescope at the Milky Way, which was originally composed of dense stars.

The densest star in the "strip" sky is a huge lenticular star system composed of more than 1000 billion stars, and our solar system is in this system. Seen from the surrounding solar system, the disk-shaped edge part is a band-shaped sky area. The star projection in this sky area is the densest, and this is the Milky Way we see. This huge star system is also named after the Milky Way, called the Milky Way.

Extended data

Related legend:

The legend of the Cowherd and the Weaver Girl originated from the ancient people's observation of the stars. It was first seen in The Book of Songs Xiaoya Dadong in the Western Zhou Dynasty. Three of the three, Vega, seven times a day. Even if the weaver girl is busy, she can't knit a stripe well. "Give him a pet cow, not a suitcase." ? Vega doesn't knit, and Altair doesn't pull carts. Here "Altair" and "Weaver Girl" refer to the names of two constellations.

In the Han Dynasty, the Cowherd and the Weaver Maid began to become myths and legends: "Black magpies fill rivers and build bridges over the Weaver Maid", and with the plot of meeting on Tanabata, on July 7th, the Cowherd and the Weaver Maid became two gods.

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