Read the full text and talk about the reason why Pangu created the world

In the ancient times, there was a giant star floating in space, shaped very much like an egg, moving silently in the endless dark clouds and mist. Just inside the giant star, there was a giant named Pangu, who had been digging with his ax in an attempt to free himself from the siege. After 18,000 years of hard work, Pangu swung his last axe, and with a loud bang, the superstar split into two halves. Half of the giant stars on Pangu's head turned into gas and continued to rise. Half of the giant stars under the feet turned into the earth, which continued to thicken, and the universe began to have heaven and earth. The sky and the earth grew three feet taller every day, and Pangu grew taller and taller, becoming a hero who "stands up to the sky and the earth".