SC vs galaxy supercluster

SC

noun

  • supercentenarian 

  • simple cubic 

  • subcutaneous injection 

  • stem cell 

  • supercapacitor 

  • supercluster (of galaxies), galaxy superclsuter 

  • superconductor 

adj

  • subcutaneous 

galaxy supercluster

How often have the words SC and galaxy supercluster occurred in a corpus of books? (source: Google Ngram Viewer )