The best caption that describes the thinner arrow is; "the moon would not stay in orbit without the pull of Earth's gravity." (Option D).
The term gravity refers to the force that would always pull objects unto the center of the earth.
The best caption that describes the thinner arrow is; "the moon would not stay in orbit without the pull of Earth's gravity." (Option D).
Learn more about gravity:https://brainly.com/question/4014727
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