Meaning: This sentence depicts the planets moving in a coordinated and harmonious way, creating a celestial spectacle.
Choice of Words: "Planets" are large celestial bodies that orbit a star. "Dance" is a verb that describes the movement of these planets in a graceful and rhythmic manner. "Gracefully" adds emphasis to the beauty and elegance of their motion. "In" indicates the location where this dance takes place, which is space.