Facts about Brown Dwarf Stars

1. 07

   Young brown dwarfs can initially burn deuterium for millions of years through nuclear fusion, allowing them to briefly achieve core temperatures exceeding one million Kelvin.

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2. 06

   L dwarfs, the coolest brown dwarfs, exhibit methane absorption in their spectra, a chemical signature that distinguishes them from hotter brown dwarf classes like M and K types.

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3. 05

   Discovered in 2014, WISE J085510.83-071442.5 is a binary brown dwarf system where both objects orbit each other every 27.5 hours, making it one of the fastest-orbiting stellar-mass pairs known.

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4. 04

   Astronomers estimate that brown dwarfs outnumber stars by roughly 10 to 1 in our galaxy, yet remain difficult to detect without infrared observations.

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5. 03

   Brown dwarfs emit most of their radiation in infrared wavelengths, which is why infrared telescopes like WISE and Spitzer have discovered thousands of them since the 1990s.

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6. 02

   In 2011, astronomers discovered WISE 1541-2250, a brown dwarf with a surface temperature around 370 Kelvin, making it cooler than Earth's boiling water.

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7. 01

   The smallest brown dwarfs have masses between 13 and 80 Jupiter masses, occupying the gap between planets and true stars.

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