An astronomer has proposed a new theory about the evolution of the universe. what is the next step that the astronomer should take to make his theory reliable?

consensus on the theory from experimentation  

Explanation:

Once the astronomer has proposed a new theory, he must evaluate methods of experimentation that provide experiments that allow his theory to be confirmed or refuted.

These experiments can be defined as sets of procedures by means of which the astronomer will be able to propose a set of explanations for phenomena, constitution and formation of materials that are involved in his theory.

idk what the question is about