Again?(chapter 1)

The year is 2030, and humanity just received a mysterious signal from the far side of the moon. All nations agreed that four brave men should be sent to the moon to investigate without further delay. Nick, an unknown and mysterious person ex-astronaut of NASA is assigned the job of Mission control and to guide the four astronauts. Upon their arrival on the moon, the astronauts, much to their horror discovered the source of the unknown signal. It WAS NOT an alien base or spaceship. The greatest discovery of humanity was before the astronauts.

Then what it was? Read and discover yourself.