How many stars are in the sky? From naked-eye stars to the observable universe
SMRTR summary
On a clear night, the naked eye can spot roughly 2,000–2,500 stars, but that's a tiny fraction of reality. The Milky Way holds an estimated 100–400 billion stars, while the observable universe contains around one septillion — a 1 followed by 24 zeros. Telescopes like James Webb and ESA's Gaia keep revealing more stars, showing astronomers how vastly underestimated the cosmos remains.
SMRTR provides this summary for quick context. The original article belongs to Interesting Engineering.
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