Home Science Physics Why is the universe flat? SciencePhysics Why is the universe flat? Cosmic inflation is a theory that was proposed in the 1980s by cosmologist Alan Guth to answer some of the most fundamental questions of the origins of our universe. It also solved the Horizon Problem and the Flatness Problem. By Watch and Study - Mar 18, 2016 213 RELATED ARTICLESMORE FROM AUTHOR Astronomy Everything, The Universe…And Life Astronomy Deep Time Astronomy A Brief History of the Universe: Astronomy #44 Astronomy Dark Energy, Cosmology part 2: Astronomy #43 Anatomy and Physiology The Skeletal System Tell us what you think!