Astrophysicist (noun)

A scientist who studies the nature of celestial objects and the universe as a whole, using the principles of physics.

Origin:

From the greek words "astron" meaning "star" and "physis" meaning "nature".

Examples:

1. The astrophysicist presented her research on the formation of black holes at the conference.
2. John is an astrophysicist who specializes in studying the properties of stars.
3. The team of astrophysicists used the telescope to observe the galaxy.
4. The astrophysicist's job is to understand how the universe works.
5. The astrophysicist published a paper on the study of dark matter.