The Reynolds Layer is a layer of
ionised hydrogen gas in the plane of the
Milky Way
The Milky Way or Milky Way Galaxy is the galaxy that includes the Solar System, with the name describing the #Appearance, galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars in other arms of the galax ...
. It was named after
Ron Reynolds who discovered that there is such gas. The layer is a disk 750,000
light year
A light-year, alternatively spelled light year (ly or lyr), is a unit of length used to express astronomical distance, astronomical distances and is equal to exactly , which is approximately 9.46 trillion km or 5.88 trillion mi. As defined by t ...
s in diameter, and 6000 light years thick. The whole disk rotates in the same direction as the Milky Way.
References
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Milky Way