What is the main reason critics cite against astronomy's hard science status?

Answer

Inability to perform controlled laboratory experiments in the traditional sense.

The primary hurdle for critics is that astronomers cannot manipulate large-scale events, like galaxy mergers, in a lab setting, forcing a reliance on passive observation even when applying highly rigorous mathematical modeling.

What is the main reason critics cite against astronomy's hard science status?
classificationastronomysciencehard science