What is "planetologists"

Usage examples of "planetologists".

Shortly after he awoke the next morning, he received a request from the astrogator via Ballmin, chief of the planetologists, to dispatch his entire material to the main laboratory.

Really, what else would a Nakada scion want with the handful of biologists and planetologists at the Ipsy, as we natives called the Institute?

Titan took the full brunt of the recoil, and some planetologists believed that it might split apart.

It is a planet as near like Earth as two planets can be, same age according to the planetologists and its star is the same age as the Sun and the same type, so say the astrophysicists.