The Dark Forest Theory put forward in the science fiction three-body tells us that human beings must not reveal the location of our earth to the universe, or they will be destroyed by alien civilizations. However, long before the publication of the three-body, in 1974, humans sent a radio signal to the constellation Hercules, more than 22000 light-years from Earth, proclaiming their existence to the universe at the speed of light. The cluster of Hercules, numbered M 13, has hundreds of thousands of stars. Scientists believe that stars are usually surrounded by planets, but there can be no life on stars, but there may be planets. People who believe in the dark forest theory can not help but worry about this reckless human behavior, thinking that human expectations may usher in a cruel reality.
There are no planetary systems in the star-dense Hercules Cluster, if true, best illustrates that this worry is unnecessary.