During the bronze age (3000 B.C. – 1200 B.C.) ancient civilisations had different theories about the earth. The Egyptians believed that the earth was Geb and the sky, Nut, whereas in Hindu mythology, it was believed that the world was supported on top of the World Turtle.
In our modern era, most of humankind have come to a consensus that the earth is suspended in space instead of being supported by anything. This scientific fact was proven after Sir Isaac Newton discovered the “law of universal gravitation” in the 17th century.
Job 26:7 He spreads out the northern skies over empty space; he suspends the earth over nothing
The author of this book of Job existed about 3,000 years ago. It was a time when advancement in science and technology had yet to reach a point when men could observe and make conclusive facts about the earth.