Question

She told me that she knows someone who studies the stars

Q: Answer-She told me that she knows someone who studies the stars and planets .

Astronomer is the correct one-word substitute as it refers to a person who studies celestial bodies such as stars and planets. 1 Chemist A chemist studies chemicals and their reactions, which does not relate to the study of stars and planets. 3 Geologist A geologist studies the Earth and its processes, including rocks and minerals, not celestial objects. 4 Biologist A biologist studies living organisms and their interactions with the environment, not celestial bodies.