In her book "Packing for Mars: The Curious Science of Life in the Void," author Mary Roach asserts the fundamental role of gravity in the universe. She posits that gravity is the driving force behind the formation of celestial bodies such as suns and planets, highlighting its significance in shaping the cosmos. Roach emphasizes that without gravity, the existence of these astronomical entities would be impossible, underscoring its essential nature.

Roach's statement also suggests a deeper philosophical view, equating gravity to a divine force. By calling it "practically God," she implies that gravity's influence is so profound and universal that it instills a sense of wonder. This perspective invites readers to appreciate not only the scientific aspects of gravity but also its awe-inspiring power in creating and maintaining the structure of the universe.