2 Trillion Galaxies: A Century of Misconceptions | Unraveling the Universe

This is an in-depth science popularization piece about the history of how humanity's view of the universe was overturned. From the "100-year mistake" to the eventual confirmation that there are at least 2 trillion galaxies in the observable universe, the video traces how astronomy step by step broke down old perceptions and reshaped our understanding of the scale of the cosmos. The core highlight is that it not only recounts the twists and turns behind key discoveries such as Hubble and dark matter, but also uses intuitive explanations to make the vast number of "galaxy count" feel tangible and comprehensible, allowing viewers to appreciate the value of "admitting mistakes" in scientific progress. It is suitable for students interested in cosmology, astronomy enthusiasts, and any general viewer curious about "how do we know these things." Viewing suggestion: first set aside preconceived notions, follow the video's narrative rhythm, and start from the "mistake" — only then can you better understand how hard-won the contemporary picture of the universe truly is.