。
Planets orbit around stars.
Literal
Planet [topic-は] star [possessive-の] surroundings [object-を] revolves.
A general astronomical statement. 恒星 (こうせい) 'fixed star, stellar star' — the word for a 'star' in the astronomical sense (a stellar body generating its own light), as distinct from 惑星 ('planet'). 回る is the intransitive 'to turn, revolve' while 回転する is more formal; both work here.