night sky
Refers to the sky at night, often with stars, moon, or darkness. Common in poetic and everyday contexts.
今夜は夜空がとてもきれいだ。
The night sky is very beautiful tonight.
彼は夜空の星を眺めるのが好きだ。
He likes gazing at the stars in the night sky.
The full moon was shining in the night sky.
He was gazing up at the night sky alone.
Fireworks burst into the night sky one after another.
A beautiful constellation spread across the night sky.