In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.

Q: Question: When a city contracts the distance across the city 
 Answer: decreases

A: As the Universe expands, galaxies move further and further apart.
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Q: Question: Dean is trying to slide a rock down a hill using less input force. The slope of the hill that will be ideal for Dean is one that has a slope that is 
 Answer: gradual

A: The more gradual the slope of the inclined plane, the less input force is needed and the greater the mechanical advantage.
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Q: Question: An asteroid hurtled toward the planet Mars. The gravitational pull between the asteroid and Mars will be stronger 
 Answer: when the asteroid gets closer.

A:
Objects that are closer together have a stronger force of gravity.
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