The sky or heavens; the expanse of air above the earth (a somewhat literary or lofty term).
朝焼けが天空を赤く染めていた。
The morning glow was dyeing the heavens red.
山頂から見下ろすと、眼下に広がる雲海と天空が一体になっていた。
Looking down from the summit, the sea of clouds below and the sky above seemed to merge into one.
詩人は夜になると 星空や天空の静けさを題材に詩を詠んだ。
The poet often wrote poems at night about the stars and the quiet of the heavens.
飛行機は青い天空を滑るように飛んでいった。
The airplane flew across the blue sky as if sliding through it.