The stars in Orion's Belt are simply massive. They are all blue supergiants: Alnitak, Alnilam, and Mintaka.
The largest and brightest, Alnilam, is 18,000 times brighter than our own Sun and 20 times as massive.
Despite appearing side by side, these stars are actually VERY far apart. For example, Alnilam is 1,000 light-years away while Alnitak is just 800 light-years away. For context, the closest star to the Sun (Proxima Centauri) is just 4.25 light-years away.
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