Where is cancer on the earth?

Cancer is located to the west of Leo and to the north of snakehead. It is the darkest of the twelve constellations. The brightest star in the constellation is only 3.8m, so you can't see the shape of a crab at all. This may be because Hercules had already hit it with a stick. That's right, it still clings to the long snake and goes along with it! Near the Delta Star in the center of Cancer (or between the two bright stars of Leo Xuanyuan XIV and Gemini Beta), people with good eyesight can see a small white fog, which was called "corpse gas" in ancient China. The book describes it as "like a cloud Feiyun, like a star but not a star, just seeing gas." It was not until the invention of the telescope that people observed that it was originally a cluster, which was called "hive cluster" in astronomy. This cluster has more than 200 members and is 520 light years away. Astronomically speaking, star clusters are divided into two categories. One is a "globular cluster" similar to Hercules. What are you doing? Fierce URL] Open the cluster ". These clusters are irregular in shape and generally distributed on silver disks. Astronomers have discovered more than 1000 open clusters in the Milky Way. They estimate that the number of open clusters in the whole galaxy must exceed 10000.