This is the 8038th most frequent Polish word.
niebo
Sky; heaven.
Here, 'niebo' is used to refer to the sky, the atmospheric expanse visible during the day or night.
Niebo dzisiaj jest całkowicie czyste.
The sky is completely clear today.
In this context, 'niebo' refers to heaven, the spiritual place of paradise in some religious beliefs.
Wierzę, że po śmierci można pójść do nieba.
I believe that after death one can go to heaven.
The sentence uses 'niebo' to describe the celestial appearance of the sky, emphasizing its visual aspect.