The true statement among the options provided is:
Hydropower uses the kinetic energy of water to generate electricity.
Here's a breakdown of why the other statements are not true:
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Solar energy can only be used on Earth. It can't be used in space. (False: Solar energy can be harnessed in space; for instance, solar panels are used on satellites.)
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Wind energy does not use a turbine or a generator to produce electricity. (False: Wind energy typically requires turbines and generators to convert wind kinetic energy into electricity.)
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Wind is the most commonly used renewable energy source in the United States. (False: While wind energy is a significant source of renewable energy, hydropower is generally the largest source of renewable energy generation in the U.S., although this can fluctuate year by year.)
Therefore, the correct answer is the first statement regarding hydropower.