planetologist
/ˌplænɪˈtɑlədʒɪst/
noun
- A scientist who studies planets, their composition, atmospheres, and geology.
- The planetologist analyzed soil samples from Mars to look for signs of water.
- As a planetologist, Dr. Chen spends most of her time studying data from space probes.
- The university hired a new planetologist to lead the research on exoplanets.