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  1. @science
    Gacrux is only 30% more massive than the Sun, yet has swollen to about 84 solar radii.
    The Largest Star in the Universe – Size ComparisonKurzgesagt – In a NutshellThe Largest Star in the Universe – Size Comparison
  2. @science
    Main-sequence stars shine by fusing hydrogen into helium inside cores hot and dense enough to ignite.
    The Largest Star in the Universe – Size ComparisonKurzgesagt – In a NutshellThe Largest Star in the Universe – Size Comparison
  3. @science
    When a star exhausts core hydrogen, its core contracts and heats, forcing its outer layers to expand.
    The Largest Star in the Universe – Size ComparisonKurzgesagt – In a NutshellThe Largest Star in the Universe – Size Comparison
  4. @science
    Supermassive stars usually stop growing around 150 solar masses when intense radiation blows away additional gas.
    The Largest Star in the Universe – Size ComparisonKurzgesagt – In a NutshellThe Largest Star in the Universe – Size Comparison
  5. @science
    Red dwarfs barely fuse hydrogen, so they stay small, cool, and dim instead of swelling after death.
    The Largest Star in the Universe – Size ComparisonKurzgesagt – In a NutshellThe Largest Star in the Universe – Size Comparison
  6. @science
    Hypergiants are expanded massive stars whose weak surface gravity lets powerful winds strip them apart.
    The Largest Star in the Universe – Size ComparisonKurzgesagt – In a NutshellThe Largest Star in the Universe – Size Comparison
  7. @science
    A massive star can shed mass and shrink into a hotter hypergiant phase as it evolves.
    The Largest Star in the Universe – Size ComparisonKurzgesagt – In a NutshellThe Largest Star in the Universe – Size Comparison
  8. @science
    Stephenson 2-18 is currently thought to be among the largest stars humans have found.
    The Largest Star in the Universe – Size ComparisonKurzgesagt – In a NutshellThe Largest Star in the Universe – Size Comparison
  9. @science
    After core hydrogen runs out, a star can expand hundreds of thousands of times larger during a brief giant phase.
    The Largest Star in the Universe – Size ComparisonKurzgesagt – In a NutshellThe Largest Star in the Universe – Size Comparison
  10. @science
    Rho Cassiopeiae packs 40 Suns of mass into a star 500 Suns wide.
    The Largest Star in the Universe – Size ComparisonKurzgesagt – In a NutshellThe Largest Star in the Universe – Size Comparison
  11. @science
    Pistol Star contains 25 times the Sun’s mass but spans 300 times its radius.
    The Largest Star in the Universe – Size ComparisonKurzgesagt – In a NutshellThe Largest Star in the Universe – Size Comparison
  12. @science
    Light takes 8.7 hours to circle Stephenson 2-18 once. An Earth aircraft would need roughly 500 years.
    The Largest Star in the Universe – Size ComparisonKurzgesagt – In a NutshellThe Largest Star in the Universe – Size Comparison
  13. @science
    After crossing a black hole’s event horizon, no one knows whether tidal forces tear you apart or a firewall destroys you.
    Black Holes Explained – From Birth to DeathKurzgesagt – In a NutshellBlack Holes Explained – From Birth to Death
  14. @science
    Stellar-mass black holes pack several solar masses into asteroid-sized diameters, while supermassive black holes sit at galaxy centers.
    Black Holes Explained – From Birth to DeathKurzgesagt – In a NutshellBlack Holes Explained – From Birth to Death
  15. @science
    An iron core can collapse in a fraction of a second, with its implosion racing at one-quarter light speed.
    Black Holes Explained – From Birth to DeathKurzgesagt – In a NutshellBlack Holes Explained – From Birth to Death
  16. @science
    A star survives because nuclear fusion releases radiation that counteracts its own gravitational collapse.
    Black Holes Explained – From Birth to DeathKurzgesagt – In a NutshellBlack Holes Explained – From Birth to Death
  17. @science
    Black-hole evaporation accelerates as it shrinks: room-temperature radiation at asteroid mass, solar heat at mountain mass, then a massive final burst.
    Black Holes Explained – From Birth to DeathKurzgesagt – In a NutshellBlack Holes Explained – From Birth to Death
  18. @science
    Hawking radiation drains a black hole when one virtual particle falls in and its partner escapes as a real particle.
    Black Holes Explained – From Birth to DeathKurzgesagt – In a NutshellBlack Holes Explained – From Birth to Death
  19. @science
    The biggest known black holes may take a googol years to evaporate, vastly outliving the universe’s habitable lifetime.
    Black Holes Explained – From Birth to DeathKurzgesagt – In a NutshellBlack Holes Explained – From Birth to Death
  20. @science
    Inside a black hole’s event horizon, every possible future direction leads inward to the singularity.
    Black Holes Explained – From Birth to DeathKurzgesagt – In a NutshellBlack Holes Explained – From Birth to Death
  21. @science
    A smaller black hole can destroy you before its horizon, while a supermassive one may let you travel far inside.
    Black Holes Explained – From Birth to DeathKurzgesagt – In a NutshellBlack Holes Explained – From Birth to Death
  22. @science
    A falling observer could watch the universe race forward in fast-forward, potentially revealing its future.
    Black Holes Explained – From Birth to DeathKurzgesagt – In a NutshellBlack Holes Explained – From Birth to Death
  23. @science
    Replace the Sun with an equally massive black hole and Earth’s orbit would largely stay the same, but Earth would freeze.
    Black Holes Explained – From Birth to DeathKurzgesagt – In a NutshellBlack Holes Explained – From Birth to Death

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