This is the 1047th most frequent Turkish word.
çıktığını
"Çıktığını" means "that it has exited" or "that it has emerged," depending on context.
In this sentence, 'çıktığını' is derived from the verb 'çıkmak' (to exit) and is used to report or describe the action of exiting by the students.
Öğrencilerin sınıftan çıktığını gördüm.
I saw that the students had left the classroom.
Here, 'çıktığını', from 'çıkmak' (to come out or to occur), expresses reasoning or causation, linking the fading of the color to prolonged exposure of the book to the sun.
Kitabın renginin solduğunu fark ettim, güneşte uzun süre kaldığından çıktığını düşündüm.
I noticed the color of the book had faded; I thought it was because it had been exposed to the sun for a long time.
In this example, 'çıktığını', again derived from 'çıkmak', describes the occurrence of an event (a fire breaking out) as reported in the news.