Difference between darkness and night sky in Korean

어둠·밤하늘

darkness — 어둠darkness
Darkness (어둠) means a time or place with little or no light. You can use it for night, a dark room, or a street when the lights are off. It is often used to talk about not seeing well or feeling a little scared.
How to say darkness

night sky — 밤하늘night sky
The night sky (밤하늘) is the sky you see after the sun goes down. People use this word when talking about stars, the moon, or how the sky looks at night. It is a common and beautiful word for everyday conversation and nature scenes.
How to say night sky

The difference

밤하늘 means the sky you see at night, often with stars or the moon. 어둠 is the dark condition itself, not the sky.