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Read the first part of the story.
Hello, Ziboos!
Dad was putting Alice and Liz to bed. "I can't believe the Ziboo fly-by is tomorrow!" Alice said.
Alice had never seen a Ziboo ship before, but she had heard a lot about them.
Every twenty-five years, the Ziboos left their planet. On their trip, they always flew over Earth. Alice could not wait to see the Ziboo ship fly across the sky.
"Is it going to be scary?" Liz asked.
"Not at all!" Dad said. "You'll never forget it."
In the story, what happens every twenty-five years?
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