Could the Firmament be a Sodium Based Glass 90-100 Kilometers Above Earth’s Surface?

“The 4LGSF complements the Laser Guide Star Facility (LGSF). Instead of one laser, the 4LGSF sends four laser beams into the skies to produce four artificial stars by exciting sodium atoms located in the atmosphere at an altitude of 90 kilometres…Lasers can excite sodium atoms in the mesosphere, which is located 90–110 kilometres above the Earth’s surface. The fluorescent light that is emitted by the sodium atoms and collected by the telescope has been affected by the atmosphere in the same way as the light emitted by real stars.”

http://www.eso.org/public/teles-instr/vlt/vlt-instr/4lgsf/

https://www.youtube.com/watch?v=Vx9vwM3r54c

This is fascinating seeing sodium is used to make a prevalent form of glass.

https://en.wikipedia.org/wiki/Soda-lime_glass

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