plan·e·tar·i·um
noun/ˌplænɪˈteəriəm/
/ˌplænɪˈteriəm/
(plural planetariums)
- a building with a curved ceiling to represent the sky at night, with moving images of the planets and stars, used to educate and entertain people
天文馆 Word Originmid 18th cent.: modern Latin, from Latin planetarius ‘relating to the planets’.