Answer: astronomers

AnswerCrossword Clue
ASTRONOMERSHalley and Herschel.
ASTRONOMERSShapely, Hale, etc.
ASTRONOMERSSome Pythagoreans
ASTRONOMERSMoon starers! (Anagram)
astronomersASTRONOMER, a person who is skilled in astronomy or who makes observations of celestial phenomena
astronomersAn expert in or student of astronomy