Astronomers Detect a Giant Galaxy Lighting Up The Universe Right After The Big Bang
About 370,000 years after the Big Bang, the Universe experienced a period that cosmologists refer to as the “Cosmic Dark Ages.”
During this period, the Universe was obscured by a hot dense plasma that obscured all visible light, making it invisible to astronomers.
As the first stars and galaxies formed over the next few hundred millions of years, the radiation they emitted ionized this plasma, making the Universe transparent.
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