adjective

Astronomical" in English means:
Relating to Astronomy: Pertaining to the science of astronomy, which is the study of celestial objects, space, and the universe as a whole.

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.