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LitFamFire
Libiboo13579
Libiboo13579

I think identification and monitoring of molecules in remote astrophysical sources interstellar clouds; exhaust gasses of cars. 

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LitFamFire
for identifying elements in a sample
for determining the distance and velocity of galaxies
for producing neon lights
for determining types of chemical bonds
for use in medical imaging devices
for killing bacteria in foods
LitFamFire
which of these are accurate for the question?