This is the 10674th most frequent Turkish word.
cisimlerin
"Of the objects" or "objects'" (possessive form).
Here, 'cisimlerin' is used in the possessive form to refer to 'the objects', emphasizing their characteristic, brightness.
Cisimlerin parlaklığı dikkat çekiyordu.
The brightness of the objects was attracting attention.
In this sentence, 'cisimlerin' denotes the objects as the possessor of the movements, indicating action.
Cisimlerin hareketlerini gözlemledik.
We observed the movements of the objects.
The usage of 'cisimlerin' in this context associates the objects with their temperature as a possession, highlighting their diversity.