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Shared December 19, 2025
The giant star Stephenson 2–18 is one of the largest known stars in the Universe. Estimates suggest its radius may be about 2,150 times the Sun’s radius, and its brightness nearly 500,000 times higher. Objects like this are classified as red supergiants: they amaze with their size and help scientists understand how the most massive stars live and die. If Stephenson 2–18 replaced our Sun, it would take up a huge part of the Solar System — the scale is truly shocking. Hit like if sizes like this scare you, and subscribe for more facts about space, astronomy, stars, galaxies, and the mysteries of the Universe.
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