What must be satisfied for a hypothesis to be useful

The following are the desirable features of a hypothesis that makes them useful:  

1. A hypothesis should be susceptible to observation, and it should not be normative.  

2. A good hypothesis should exhibit a generality.  

3. A hypothesis should be specific, that is, the concepts are defined in a careful manner.  

4. A good hypothesis should not defy logic.  

5. And ultimately, a good hypothesis needs to be testable.  

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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