Comets streaked across sky.
Meaning: This sentence describes the rapid movement of comets as they leave a trail of gas and dust across the sky.
Choice of Words: Comets are icy objects that have a tail of gas and dust. Streaked means to move quickly, leaving a trail behind. Across is used to indicate movement from one side to the other of something. Sky refers to the upper part of the atmosphere that we can see.
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