Comets streak across the sky with tails.

Meaning: Comets move very fast across the sky and have long, thin parts that trail behind them.

Choice of Words: Comets are objects made of ice and rock that move around the sun. Streak means to move quickly in a line. Across means from one side to the other. Sky is the area above the earth. Tails are the long, thin parts of a comet that trail behind it.

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