Pre-Show Discovering the Universebillion years ago a sudden expansion of space marked the origin of the universe. This event is known as the Big Bang. 2) In its hot dense state, the observable universe inflated

First Page		Document Content
		Pre-Show Discovering the Universebillion years ago a sudden expansion of space marked the origin of the universe. This event is known as the Big Bang. 2) In its hot dense state, the observable universe inflated Add to Reading List Source URL: www.amnh.org Download Document from Source Website File Size: 18,54 KB Share Document on Facebook