The Largest Star In The Universe

What is the largest star in the universe? The answer Google gives you is WRONG. For years, UY Scuti held the title of the biggest star ever discovered, but new data from the Gaia space telescope and a groundbreaking 2023 study cut its size nearly in half. So which star is actually the largest?

WATCH MORE: Largest Structures in the Universe
https://www.youtube.com/watch?v=hgyMPz5Bse4

In this video, we break down the real contenders, Stephenson 2-18, WOH G64, VY Canis Majoris, and more, and explain why measuring giant stars is one of the hardest problems in astronomy. From red supergiants that swallow entire orbits to dying monsters that will one day explode as supernovae visible from Earth, the truth about the universe’s biggest stars is far stranger than you think.

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A Cosmoknowledge production.

Graphics:
YT Dunlap Institute, 2MASS, ESO,
Universe Sandbox, Space Engine,
Digitized Sky Survey 2,
N. Risinger (skysurvey.org),
R. Gendler, ESO, M.-R. Cioni,
VISTA Magellanic Cloud survey,
VPHAS+ Survey, N. Wright, ESA,
YT Scientific American, Space Lab,
IAU Sky & Telescope, YT Alex Evett

Music:
liosound – Violin
Eddie Honcha – Uneartly Violin
Original Soundtrack – Suspense Logo
Scorewizards – A Class Above
Difourks – Soft Bloom Serenity

Research papers:
– UY Scuti
https://arxiv.org/abs/1305.6179
Revised 909 R☉ Measurement:
https://arxiv.org/abs/2307.08785
– Stephenson 2-18
Size and Luminosity Estimates:
https://iopscience.iop.org/article/10.1088/0004-637X/760/1/65
Cluster Identification:
https://arxiv.org/abs/0708.0821
Cluster Membership Analysis:
https://arxiv.org/abs/1303.1837
– VY Canis Majoris
Radius and Fundamental Parameters:
https://arxiv.org/abs/1203.5194
– WOH G64
Physical Properties:
https://arxiv.org/abs/0903.2260
– Westerlund 1-26 (W26)
Cluster Study:
https://arxiv.org/abs/1309.4086
– Mu Cephei (Garnet Star)
Radius and Parameters:
https://arxiv.org/abs/1903.07129
– Theoretical Stellar Radius Limits
Mass Loss and Evolution:
https://arxiv.org/abs/2008.01108
Hayashi Limit and Stellar Evolution:
https://arxiv.org/abs/astro-ph/0504337

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