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Glossary term: Big Bang Theory

Description: The Big Bang theory is the basic explanation for the evolutionary stages of the Universe. In its simplest form, this theory gives us an idea of the origin of the Universe and its expansion over the next 13.8 billion years, to become the Universe we know today. Because our current tools do not allow astronomers to look back to the beginning of the Universe, much of what we understand about the Big Bang theory comes to us from mathematical models and theories. However, astronomers can measure the "echo" of this expansion through a phenomenon known as the Cosmic Background Radiation.

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The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".