Facts about Hydrogen Alpha

1. 05

   Mapping hydrogen alpha emission across the Milky Way has allowed astronomers to chart the spiral arm structure of our galaxy.

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2. 04

   Dedicated hydrogen alpha telescopes use extremely narrow bandpass filters, often just fractions of a nanometer wide, to isolate this spectral line from other light.

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3. 03

   Hydrogen alpha emission is produced when an electron in a hydrogen atom transitions from the third to the second energy level.

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4. 02

   Solar astronomers use hydrogen alpha filters to observe solar flares and prominences on the Sun's chromosphere in real time.

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5. 01

   The hydrogen alpha spectral line, at a wavelength of 656.28 nanometers, gives emission nebulae their characteristic red color in astronomical images.

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