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The Boy Who Cried Comet
From Arthur Wiki
The Boy Who Cried Comet is an Arthur episode from Season 6
Premise
Buster thinks he's seen a UFO, but no one believes him because he's said he's seen a UFO too many times. He borrows Muffy's telescope and finds a comet headed for earth. No one believes him, but this time he has proof. They discover that the telescope is malfunctioning.