For a long time, people believed that the earth was the only known planet that could support the existence of life, but this situation began to change. Scientists recently pointed out that there may be more habitable planets around other stars. They tried to use new methods to search for extraterrestrial life, that is, search for the radioactive elements thorium and uranium. The more these elements are contained in a planet, the higher its internal temperature will be, which helps the plate motion of the planet to a certain extent, and the plate motion helps to maintain the water on the surface of the planet. 
the plate motion can be regarded as a planet. One of the signs of the existence of a livable environment.
Although it has not been confirmed, extraterrestrial life must exist