No aliens found yet, but 'heartbeats' in universe heard

The world's largest radio telescope is located deep in Southwest China's Guizhou province

One is rapid and strong, and the other is slow and weak, like the heartbeats of a youth and an old man passing through a distance of thousands of light years, and then heard by the most sensitive "ear" on Earth.

The "ear" is the Five-hundred-meter Aperture Spherical Telescope (FAST), the world's largest radio telescope, with a dish as large as 30 football fields. It is located in a valley deep in Southwest China's mountainous Guizhou province.