Solving Mysteries with the Ancient Galaxies Next Door - SciShow News

The video explores how telescopes act as time machines, allowing us to see older cosmic objects. It highlights the discovery of faint galaxies around the Milky Way and Andromeda, which are among the oldest known. These galaxies help us understand the epoch of reionization, a period when star formation nearly halted. Recent research uses these galaxies to estimate when reionization occurred, suggesting it happened later than previously thought. The video also discusses the challenges in this research and the potential for future discoveries.

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