If the brown dwarf spins rapidly, these features get smeared out due to the Doppler effect, where light gets shifted a bit in wavelength as an object approaches or recedes from us. When an object spins, part of it moves toward us and part moves away, so the overall effect is to broaden the spectral features in wavelength.
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Python for Microcontrollers – Adafruit Daily — Python on Microcontrollers Newsletter: A New Arduino MicroPython Package Manager, How-Tos and Much More! #CircuitPython #Python #micropython @ThePSF @Raspberry_Pi
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