Why didn't the three-body civilization immigrate to dx3906?

Three-body is a series of long science fiction novels written by Liu, which consists of Three-body, Three-body Ⅱ Dark Forest and Three-body Ⅲ Death and Eternal Life. The first article was serialized in Science Fiction World magazine in May 2006, the second article was first published in May 2008, and the third article was published in 2065438+ 10.

The work tells about the information exchange between human civilization and three-body civilization on the earth, the life-and-death struggle and the rise and fall of the two civilizations in the universe. His first novel was translated by Liu Yukun and won the Best Novel Award in the 73rd Hugo Award.

This story sets the planet dx3906 over 200 light years. The technology of three-body civilization took thousands of years to get there, and three-body civilization did not have the ability to obtain the specific information of the planet at that time.