This is the 3111th most frequent Turkish word.
büyüklüğünü
"The greatness or size of something."
The word 'büyüklüğünü' refers to the dog's physical size being noticed.
Köpeğin büyüklüğünü fark ettim.
I noticed the dog's size.
Here, 'büyüklüğünü' metaphorically represents the extent or scope of the project.
Projenin büyüklüğünü tam olarak anlayamıyoruz.
We cannot fully understand the magnitude of the project.
'Büyüklüğünü' reflects on the immense scale or vastness of the universe.