who is the former by profession?
A French astronomer
Pierre Janssen
a French astronomer 
what does noble gas mean? Odorless, colorless, monatomic gases with very low chemical reactivity. who discovered the first nobel gas? Pierre Janssen and Joseph Norman Lockyer and which was it? Helium
wiki:5024019
Pierre Janssen [SEP] Introduction
Pierre Jules César Janssen (22 February 1824 – 23 December 1907), also known as Jules Janssen, was a French astronomer who, along with English scientist Joseph Norman Lockyer, is credited with discovering the gaseous nature of the solar chromosphere, and with some justification the element helium.