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Cosmic timeline: What's happened since the Big Bang
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![This illustration shows how astronomers believe the universe developed from the "Big Bang" 13.7 billion years ago to today. They know very little about the Dark Ages from 380,000 to about 800](https://c8.alamy.com/comp/2F1BTKB/this-illustration-shows-how-astronomers-believe-the-universe-developed-from-the-quotbig-bangquot-137-billion-years-ago-to-today-they-know-very-little-about-the-dark-ages-from-380000-to-about-800-million-years-after-the-big-bang-but-are-trying-to-find-out-photo-by-nasawmap-science-teammctsipa-usa-2F1BTKB.jpg "This illustration shows how astronomers believe the universe developed from the "Big Bang" 13.7 billion years ago to today. They know very little about the Dark Ages from 380,000 to about 800")
This illustration shows how astronomers believe the universe developed from the "Big Bang" 13.7 billion years ago to today. They know very little about the Dark Ages from 380,000 to about 800
