おやすみロックスター (oyasumi rokkusuta)
The word 'rock star' was borrowed from English in Japanese and so mimics its pronunciation. The word isロックスター (rokkustaa).
It's the same "Rock Star"
"Goodnight".
goodnight!
goodnight
hikaru
'Hoshi.'
岩 (iwa) is like a small rock and 石 (ishi) can be used for small stones, jewels or gems.
In British English, you can say "goodnight" or "night" as a shorter version.
if you mean shooting star its nagare boshi
In Sondhi, you can say "ດີ່ນກັນ" (dien kan) to say goodnight.
goodnight is "bonne nuit" in France.