Update Astrophysics for People in a Hurry by Neil deGrasse Tyson.md

Astrophysics for People in a Hurry by Neil deGrasse Tyson.md

@@ -23,7 +23,8 @@ Conservation laws (the amount of some measured quantify remains unchanged *no ma
 
 - As photons cool, they walk down the spectrum
 - Visible light photons are a 1/1000th as energetic since the big bang. They continue to degrade/cool and will eventually make the *cosmic microwave background* the *cosmic radiowave background*.
-- Photons : Astrological-time :: Carbon(dating) : Geological-time
+- Photons : Astrological-time :: Carbon dating : Geological-time
+    - Spectroscopy : Physicist :: Carbon dating : Geologist
 
 ## Between the Galaxies