adjective

"Astronomical" refers to anything related to astronomy or space. It can also be used to describe something extremely large, like "an astronomical amount" meaning a very large amount.

Example

1. The astronomical observations made by the telescope provided important data for the study of the universe.
2. The cost of the new space mission is astronomical, but the scientific benefits are expected to be significant.
3. The distance between the Earth and the nearest star is so astronomical that it's hard to comprehend.