Facts about Alnilam

1. 08

   Named Alnilam by medieval Arabic astronomers, this supergiant's designation derives from the phrase meaning the string of pearls in Orion's Belt.

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2. 07

   Stellar winds from Alnilam flow outward at approximately 2,000 kilometers per second, creating a dynamic nebula around this supergiant star.

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3. 06

   Approximately 2,000 times more luminous than Sirius, Alnilam ranks among the brightest stars visible without telescopes despite its enormous distance from Earth.

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4. 05

   Within approximately 2.2 million years, Alnilam will exhaust its hydrogen fuel and explode as a supernova, ending its brief 10-million-year lifespan as a main-sequence star.

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5. 04

   Alnilam's mass exceeds our Sun's by approximately 19 times, making it one of the most massive stars visible to the naked eye from Earth.

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6. 03

   Alnilam's spectral classification as B0 Ia supergiant indicates a surface temperature of approximately 12,000 Kelvin, making it roughly twice as hot as our Sun.

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7. 02

   Around 50 kilometers wide, Alnilam's stellar envelope expands and contracts dramatically due to its classification as a Beta Cephei variable star.

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8. 01

   The middle star of Orion's Belt, Alnilam, shines approximately 26,500 times brighter than our Sun despite being 900 light-years away.

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