Meaning: This sentence portrays the nebula as a cosmic entity engaged in an ethereal dance, captivating the imagination with its beauty and grace.
Choice of Words: The verb "swirled" describes the graceful and mesmerizing movement of the nebula, akin to a cosmic ballet. The noun "cosmic" emphasizes the celestial nature of the nebula, while the noun "dance" evokes a sense of rhythm and harmony in its motion.