noun. An astronomer who occupies himself with astrophysics.

noun. an astronomer who studies the physical properties of celestial bodies.

noun. One who studies astrophysics.

noun. an astronomer who studies the physical properties of celestial bodies

"Ravi Sood, an astrophysicist from the University of New South Wales who was overseeing the balloon launch, said quick-changing wind conditions can cause difficulties for launching such large balloons."

astronomer  stargazer  uranologist  

Hoyle  Hubble  edwin hubble  edwin powell hubble  fred hoyle  

agronomist  astrologer  breeching  co-discoverer  cosmologists