Answer: astronomer

AnswerCrossword Clue
ASTRONOMERPalomar scientist.
astronomerexpert in astronomy; scientific observer of the celestial bodies
astronomera person who is skilled in astronomy or who makes observations of celestial phenomena
ASTRONOMERSatellite tracker
ASTRONOMEROne who knows what's up?
ASTRONOMERGalileo was one
ASTRONOMERHis business is looking up
ASTRONOMERHalley, e.g.
ASTRONOMERWhat a mixed-up "moon-starer" really is
ASTRONOMERTycho Brahe, for one
ASTRONOMERSIR CHRISTOPHER WREN
ASTRONOMERShapley, for example.
ASTRONOMERSir James H. Jeans.
ASTRONOMERApt anagram of MOON STARER
ASTRONOMERCopernicus, notably
ASTRONOMERGalileo, for one
ASTRONOMERHubble, for one
ASTRONOMERCelsius, for one
ASTRONOMERA student hoping to become an ... took a short-answer test...